Biography of Madame Curie

Biography of Maria Skłodowska Curie

A leading figure in the history of sciences, Marie Curie was prohibited from higher education in her native Poland. Many years later, she became the first woman Nobel laureate. She remains the only person to win the most coveted prize in two different sciences. This is her story.


Childhood

Maria was born in 1867 in Warsaw (Poland) which was then part of the Russian Empire. She was the fifth and youngest child of well-known science professor Władysław Skłodowski. Her mother, Marianna Bronisława operated a reputed boarding school for girls in the big bustling city.


When Maria was seven years old, her eldest sibling died of typhoid and then three years later her mother lost the battle to tuberculosis. At the same time, Władysław was fired from his job due to pro-Polish sentiments and the family eventually lost all the savings.

In the middle of crisis, Władysław decided to join a low-paying teaching job. The Russian authorities at the school banned the usage of laboratory equipment so he brought it home and instructed his children in its use. In this way, Maria was taught to experiment at an early age.


Teenage

For some years, Maria was home-schooled. But her father recognized her talent for scientific thinking and learning. Therefore, despite economic troubles, she was admitted to a prestigious learning centre for girls. Maria graduated with a gold medal in 1883 aged sixteen.

She was unable to join any regular institution of higher education because she was a woman. Her father then suggested to join the "secret flying university" a Polish patriotic institution (often in conflict with the governing Russian Empire) which welcomed women students.

During this time, she fell in love with a young man (who'd later go on to become a prominent Polish mathematician), Kazimierz Żorawski, his name. The two discussed marriage, but Żorawski’s parents rejected Marie due to her family's poverty and Kazimierz was unable to oppose them.


Higher education

Maria returned home to her father in Warsaw. The loss of relationship with Żorawski was heartbreaking for her and Władysław was devastated seeing his daughter in pain. Three years later, in 1890, he was able to secure a more lucrative position again and arranged for Maria to reach Paris.

Biography of Maria Skłodowska Curie
Maria and her father

Maria proceeded her studies of physics and chemistry in the University of Paris where she would be known as Marie. She focused so hard on her studies that she sometimes forgot to eat. In 1893, Marie Skłodowska was awarded a degree in physics at age 26.



In 1894, she began her research career with an investigation of the magnetic properties of various steels. That same year French physicist Pierre Curie entered her life; and it was their mutual interest in natural sciences that drew them together.


Marriage

Eventually they began to develop feelings for one another and Pierre proposed marriage. Marie returned to Warsaw and told her father that in Pierre, she had found a new love, a partner, and a scientific collaborator on whom she could depend. Władysław agreed.

But she was still living under the illusion that she would be able to work in her chosen field in Poland. Pierre declared that he was ready to move with her to Poland, even if it meant being reduced to teaching French.

Things hadn't changed though as she was denied again because of her gender. A letter from Pierre convinced her to return to Paris and work with him in his small laboratory. In 1895, they were married and for their honeymoon, took a bicycle tour around the French countryside.

Biography of Maria Skłodowska Curie

The Curies also got going with their research work in a converted shed (formerly a medical school dissecting room) which was poorly ventilated and not even waterproof. But they were very dedicated scientists and hardly discouraged by such problems.

Radioactivity

In 1896, Henri Becquerel discovered that uranium salts spontaneously emitted a penetrating radiation that could be registered on a photographic plate. Marie was intrigued by this new phenomenon (she coined the term radioactivity) and decided to look into it.

She hypothesized that the radiation was not the outcome of some interaction of molecules but must come from the atom itself. She began studying two uranium minerals, pitchblende and torbernite, and discovered that both pitchblende and torbenite were far more active than uranium itself.

Marie concluded that the two minerals must contain small quantities of radioactive substances other than uranium. In 1898, the couple announced their discovery of Polonium and Radium, elements previously unknown, which were far more active than uranium.

Biography of Maria Skłodowska Curie

Four years later in 1902, the husband and wife team was able to separate 0.1 gram of radium chloride from a ton of pitchblende, a remarkable achievement, for which the duo shared the Nobel Prize in physics with Henri Becquerel.

The award money allowed the Curies to hire their first laboratory assistant. However, the Curies still did not have a proper laboratory. Upon Pierre Curie's complaint, the University of Paris relented and agreed to create a new laboratory, but it would not be ready until 1906.



In 1906, walking across a street of Paris in heavy rain, Pierre was struck by a horse-drawn vehicle and fell under its wheels, causing his skull to fracture. Marie, by then a mother to two beautiful daughters, Irène and Ève, was traumatized by her husband's death.

She continued to work in the new laboratory hoping to reach greater heights in physics and chemistry as a tribute to her husband Pierre. In 1910, she isolated the pure radium metal; and also defined a new unit  of radioactivity called "curie" in the memory of her late husband.


Affair & death

In 1911, Marie was on the front pages of local tabloids as a "foreign home-wrecker" after having an affair with French physicist Paul Langevin, a married man who was estranged from his wife. The news was exploited by her academic opponents, one declaring her "a detestable idiot."

There's no denying that the affair was painful for Langevin’s family, particularly for his wife, Jeanne, but at the time when the news broke out, Marie was giving a lecture in Brussels. And when she returned to Paris, she found an angry crowd outside of her house and had to seek refuge, with her little daughters.

The Swedish Academy of Sciences honored her a second time despite the Langevin Scandal. She was awarded the Prize in Chemistry for isolating radium hence becoming the only person to win Nobel Prize in two different sciences.

A month after accepting her 1911 Nobel Prize, she was hospitalized with depression and a kidney ailment. During her time at the hospital, she received a letter from Einstein, essentially saying, "please ignore the haters." Marie returned to her laboratory after a gap of about 14 months.

Biography of Maria Skłodowska Curie

From then onwards, it became very difficult to focus on the sciences and even more so during the World War I. Also perhaps because Marie could not forgive herself after the incident. The war ended, and she was invited to Warsaw in a ceremony, laying the foundations of the Radium Institute.

Curie visited Poland for the last time in early 1934 (before the second world war) where she died of aplastic anemia, a condition due to long exposure to radiation. Her final resting place was decided Paris Panthéon alongside her husband Pierre. In 1935, a life-size statue of Maria Skłodowska Curie was established in a Warsaw park facing the Radium Institute.



Personality

She used to wear the same dress to laboratory every day, "If you are going to be kind enough to give me one," she instructed regarding a proposed gift for her wedding, "please let it be practical and dark so that I can put it on afterwards to go to the laboratory."

She refrained from patenting the radium-isolation process, so that the scientific community could do their research unhindered. Scientific endeavors were more dear to her than monetary benefits. In fact, she even gave much of her Nobel Prize money to friends, family, students, and research associates.

Biography of Maria Skłodowska Curie

The curies were not religious and Marie was agnostic by choice. Neither wanted a religious service for their marriage ceremony. She wore a dark blue outfit, instead of a bridal gown, which would be worn by her in the lab for years to come. One of the guests quipped, "Skłodowska is Pierre's biggest discovery."


Today, the radium is used to produce radon, a radioactive gas which is used to treat some types of cancer. At the time of their discovery, a new industry began developing, based on radium (as in self-luminous paints for watches), but the Curies did not patent their discovery and benefited little from this increasingly profitable business.

Marie had the strong conviction that her work would provide important benefits for the rest of humanity, "I am one of those who think that the world will draw more good than evil from new discoveries," her passion for science was aroused in her early years, and remained intact until her last breath.

In her final years, she advocated bravely for invoking a scientific approach in the people, "Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less," she would say.

Ultimate Source of Motivation For Physics Students

physics quotes which will inspire students to study physics and maths

Whether you are high school student interested in physics, or college freshman ready to tackle the challenging subject, a word of motivation is always desirable. The following is a list of encouraging quotes from prominent scientists which will make you respect and value physics even more than before.


Lise Meitner

She said, "I love physics with all my heart. It is a kind of personal love, as one has for a person to whom one is grateful for many things. The study of physics makes me try to fight selflessly to reach truth and objectivity. It also teaches to accept reality with awe and admiration, not to mention the amazement and joy that come along with it."

physics quotes which will inspire students to study physics and maths

Meitner was Austrian-Swedish physicist who studied nuclear physics and radioactivity. She led a team of researchers that discovered "nuclear fission", a term she coined, but she was ignored in 1945 when her colleague Otto Hahn was awarded the Nobel Prize and she wasn't.



Albert Einstein

Einstein said, "The most incomprehensible thing about the universe is that it is comprehensible. And this is the miracle of the human mind, to use its constructions, concepts, and formulas as tools to explain what one sees, feels and touches. So try to comprehend a little more every day and simply do not stop questioning. Worry not about what you cannot answer, because curiosity has its own reason for existence."

physics quotes which will inspire students to study physics and maths

Albert Einstein was a German scientist who was awarded the 1921 Nobel Prize in physics for his explanation of the photoelectric effect. As a theoretical physicist, he had many discoveries, but perhaps best known for his theories of special and general relativity and the energy-mass relation E=mc² which foreshadowed the development of the atomic bomb.

Einstein said further, "Do not accept traditional concepts without reexamining them. Even overthrow my relativity theory, if you find a better one. You must believe that the world is comprehensible to man. Of course, it's going to take an infinite long time to investigate this unified creation but to me that is the highest and most sacred duty-unifying physics."


George Gamow

Excerpt from his book, which hints that physics can be as interesting as any Hollywood movie, "It was a bank holiday, and Mr Tompkins, the little clerk of a big city bank, slept late and had a leisurely breakfast. Trying to plan his day, he first thought about going to some afternoon movie and, opening the morning paper, turned to the entertainment page. But none of the films looked attractive to him. He detested all this Hollywood stuff, with infinite romances between popular stars."

"If only there were at least one film with some real adventure, something unusual and maybe even fantastic about it. But there was none. Unexpectedly, his eye fell on a little notice in the corner of the page. The local university was announcing a series of lectures on the problems of modern physics, and this afternoon's lecture was to be about Einstein's Theory of Relativity. Well, that might be something!

physics quotes which will inspire students to study physics and maths

Gamow was Ukrainian-American cosmologist and experimental physicist. He was an early developer and advocate of the Big Bang Theory. Equally famous for his contributions to radioactivity and molecular genetics and most well-known for his popular science books like Mr Tompkins' adventures and One, Two, Three... Infinity.


Galileo Galilei

Galileo said, "It has been observed that missiles and projectiles describe a curved path of some sort; however no one has pointed out the fact that this path is a parabola. This and other facts, I have succeeded in proving; but what I consider even more important," he added, "that there have been opened up to this vast and most excellent science, of which my work is merely the beginning, ways and means by which, other minds more acute than mine will explore its remotest corners."

physics quotes which will inspire students to study physics and maths

Italian physicist Galileo Galilei is remembered mainly for his astronomical discoveries such as moons of Jupiter, rings of Saturn, sunspots and so on. But he also was a pioneering experimental scientist who helped debunk the Aristotelian belief systems, with measurements. He questioned authority, which is the most important trait in a scientist.


Paul Dirac

This very skinny mathematician had famously said, "A good deal of my research work in physics has consisted in not setting out to solve some particular problems, but simply examining mathematical quantities of a kind that physicists use, and trying to get them together in an interesting way regardless of any application that the work may have. It is simply, a search for pretty mathematics. It may turn out later that the work does have an application. Then one has had good luck."

physics quotes which will inspire students to study physics and maths

Dirac was a British theoretical physicist who made fundamental contributions to the development of quantum electrodynamics. He quantised the gravitational field, formulated the most logically perfect presentation of quantum mechanics and predicted the existence of anti-matter. At the same time, he was also equally famous for his strange, unapologetic behavior.


Marie Curie

She said, "All my life through, the new sights of nature made me rejoice like a child. We should not allow it to be believed that scientific progress can be reduced merely to mechanisms, machines and gearings, even though, such machinery also has its beauty. But there is, in science, a spirit of adventure and if I see anything vital around me, it is precisely that spirit of adventure, which guides me in my journey."

physics quotes which will inspire students to study physics and maths

A leading figure in the history of sciences, Marie Curie was prohibited from higher education in her native Poland. She then moved to Paris in 1891 for studying physics and chemistry. She went on to become the only person in the world to have won the Nobel Prizes in both sciences.


Carl Sagan

Excerpt from the book The Dragons of Eden, "Without these experimental tests, very few physicists would have accepted general relativity. There are many hypotheses in physics of almost comparable brilliance and elegance that have been rejected because they did not survive such a confrontation with experiment. In my view, the human condition would be greatly improved if such confrontations and willingness to reject hypotheses were a regular part of our social, political, economic, religious and cultural lives."

physics quotes which will inspire students to study physics and maths

Carl Sagan was an American astrophysicist and author best known for his research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. He also assembled the first messages to space which went along with the Voyager spacecraft.


Michio Kaku

Michio Kaku is a Japanese-American theoretical physicist and futurist best known for his popular science books. Kaku was recognized as one of the pioneers of the string theory when he authored the first papers describing the string theory in a field form. He has said, "It must be a strange world not being a scientist, going through life not knowing, or maybe not caring, about where the air came from, and where the stars at night came from, or how far they are from us. I want to know."

physics quotes which will inspire students to study physics and maths

The point made here is not necessarily to persuade the public to join sciences and maths professionally. He has in fact emphasized on the importance of scientific temper, as a way of life, to include observing and questioning in our day-to-day life.


Neil deGrasse Tyson

There are street artists, street musicians and even street actors. But there are no street physicists because in physics, you can't just make stuff up and presume that it is a proper account of nature. At the end of the day, you have to answer to nature.

Since everyone has nature to answer to, your creativity is simply discovering something about the physical world that somebody else would have eventually discovered exactly the same way. They might have come through a different path, but they would have landed in the same place.

Even though we name theorems and equations after the people who discover them, such as, Newton's laws of gravity, Kepler's laws of planetary motion, Einstein's energy-mass equation, and so on, somebody else would have also discovered them afterward, it is that simple."

physics quotes which will inspire students to study physics and maths

Neil Tyson is an American astrophysicist who was a postdoctoral research associate at Princeton University from 1991 to 1994. Tyson joined the Hayden Planetarium where he founded the Department of Astrophysics in 1997. He's best known for popularizing astronomy through his shows and books.


Richard Feynman

A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he meant that, for poets do not write to be understood. But it is true that if we look at a glass of wine closely enough we see the entire universe.

There are the things of physics: the twisting liquid which evaporates depending on the wind and weather, the reflections in the glass, and our imagination adds the atoms. The glass is a distillation of the Earth's rocks, and in its composition we see the secrets of the universe's age, and the evolution of stars.

What strange arrays of chemicals are in the wine? How did they come to be? There are the ferments, the enzymes, the substrates, and the products. There in wine is found the great generalization: all life is fermentation. Nobody can discover the chemistry of wine without discovering, as did Louis Pasteur, the cause of much disease. How vivid is the claret, pressing its existence into the consciousness that watches it!

physics quotes which will inspire students to study physics and maths

Richard Feynman was an American scientist, widely considered to be one of the greatest and most influential theoretical physicists in history. He revolutionized the field of quantum mechanics and formulated the theory of quantum electrodynamics for which he received the Nobel Prize in physics in 1965.

10 Recommended Books For Physics Students

best physics book beginner 10 recommended physics books india

The following is a complete (all-you-need) list of books that every physics student has to have in their library at home. From popular science best-sellers, to comprehensive guides and textbooks, this has it all. Want to study physics? Then read these books!


A brief history of time

Hawking wrote the book for non-specialist readers with no prior knowledge of physics and astronomy. He clearly possessed a natural teacher's gifts: easy good-natured humour and ability to illustrate the complexities of the subject through well thought out analogies.


The book has sold more than 10 million copies in 20 years, and was translated into more than 30 languages by 2001. You may like to know: what makes it everyone's favorite? There are many, many things, including:

  • A concise introduction by renowned astronomer, Carl Sagan, who declares Hawking a worthy successor of Newton and Dirac
  • A whole range of topics (from the big bang to black holes) makes it the single best book on astrophysics for the common reader
    10 recommended physics books india
  • Illustrations by award-winning artist, Ron Miller, add to the beauty and mystery of science
  • Mix of history and philosophy of physics and narration by Stephen Hawking

All in all, the book is a masterpiece, suggested to anyone who's driven by their curiosity. It infuses our thinking and questioning with a spiritual aspect: was there a beginning of time? why there's something rather than nothing? is the universe infinite or does it have boundaries? and, is there a god required to create it?



Feynman lectures Vol.1

Nobel Prize winning physicist, Richard Feynman, has often been called "the great explainer", particularly because of this book, which is held in high regard, especially by teachers, and even by leading physicists of the current times.


There are 52 chapters in the first Feynman book alone, and each topic has been presented with unwavering enthusiasm and insight. The book is based on a series of lectures delivered by Feynman (on the request of California Institute of Technology) to undergraduate students. Even professors attended the lectures!

The Feynman lectures on physics are beautiful books, which will teach you a considerable amount of the long-view of physics. They will also inspire you and have you feeling as though you really understand physics for the first time in your life. Mainly mechanics, radiation and heat is recommended for the start.


Mathematical Methods

What is physics without maths? Plain observation, to be honest! Therefore, it is absolutely necessary to get yourself familiar with mathematical methods in order for you to translate the physical reality into concrete concepts and language. There are hundreds of books available but none of them as good as this one:


What makes it stand out from the crowd? As you can tell from the image, it is a thick textbook (1362 pages) of math, containing 31 chapters: from preliminary algebra, to beginner and advanced-level calculus, from complex numbers to quantum operators. In short, whatever's required to do physics and engineering, the book has it!



Quantum mechanics

This book written by renowned American physicist and professor Leonard Susskind is an excellent introduction to quantum mechanics from the ground level (pun intended). It contains in-depth physics as well as minimum mathematical tools required to tackle the most bizarre field of science.


One may also consider the book by David Griffiths which is more mathematically inclined than Susskind's book. The book is full of illustrative examples and numerical exercises at the end of each chapter. For fun and non-serious reading, buy Graphic guide to Quantum mechanics.


For the love of physics

In this book, Professor Walter Lewin will introduce a mystery and then show how you can understand it with just a little bit of physics. 'The' Bill Gates himself has endorsed the book by saying, "The book captures Lewin's extraordinary intellect, passion for physics, and brilliance as a teacher."

According to Walter Lewin, "Teachers who make physics boring are criminals.. and if you hate physics, you have probably learned it from the wrong teacher." Because, he says, "Physics is naturally interesting!"


For more than 40 years, Professor Lewin has honed his singular craft of making physics not only accessible but truly fun.This book has his stories, his research in physics, tips on teaching, and serves as an all-round motivation for students, to love and enjoy physics of everyday life.

10 recommended physics books india

When you finish reading the book, you will feel blessed, reminded of the tiny miracles of physics, happening all the time, around you. According to one review on Amazon, "If you like physics, this book's for you. If you hate physics, this book's for you. Lewin is phenomenal!"



Relativity

Published by Einstein himself with the aim of giving an exact insight into the theory of relativity to those readers who, from a general scientific and philosophical point of view, are interested in the theory, but who are not conversant with the mathematical toolkit of theoretical physics.


Both special and general versions of the theory have been included in the book. Einstein has succeeded in putting across the fundamentals of his theory for undergraduate students before they can decide to go deep in the field.


Handbook of formulas

If you want to keep important notes, key terms, definitions and formulae of physics by your side, then this book is made for you. It is about 450 pages thick and recommended for revision purposes in all exams, especially for classes 11 and 12.

The chapters have been illustrated with well-designed diagrams and illustrations with examples. The book is a handy book, which can be used as ready reference. On the whole, the data is precise and presented in a form that can help students in the long run.



Cosmos

The word "cosmos" has ancient origin but popularized first by American astronomer Carl Sagan in the twentieth century. In this book, he has told the story of fifteen billion years of cosmic evolution, science and civilization, in the most comprehensible and exciting way.



This book has 13 chapters on a range of topics: astronomy, physics, chemistry, biology, psychology and philosophy. In one sentence, "it is amalgamation of the sciences" in one book, a complete text that every mind passionate about learning must own.

In fact, the book also became an inspiration for the likes of Neil deGrasse Tyson, who went on to become an astrophysicist himself! He followed further in the footsteps of his hero and created a TV show of the same name, Cosmos: A Spacetime Odyssey.

Written some 38 years ago, the book single-handedly managed to draw the attention of people towards the wonders of science; for the first time in history, science no more seemed alien and became a thing of familiarity. Cosmos is relevant even today, for the data, the thought processes, the inferences remain all the same.


Halliday Resnick Walker

This well-known textbook is often called the bible for physics. It is recommended for high school students to prepare for competitive examinations like IIT-JEE. In 2002, the American Physical Society named it the most outstanding introductory physics text of the 20th century.


The textbook covers all the fundamental topics in physics:

  • Mechanics
  • Waves
  • Thermodynamics
  • Electromagnetism
  • Optics
  • Special Relativity
  • Quantum theory
  • Nuclear physics
  • Cosmology

It is as good as its Indian equivalent Concepts of Physics by H.C. Verma. The book by Professor Verma is divided over two parts but this book is 1300 pages, all-in-one, making it the first choice of many aspirants.


Autobiography of Feynman

Richard Feynman was an artist, a story-teller and an everyday joker whose life was a combination of his intelligence, curiosity and uncertainty. This book is his autobiography written with his friend Ralph Leighton.

According to one review, "It is a good funny read for everyone who loves physics and common sense. Easy and engaging language which takes you back in those days when Feynman stood tall among all giants of physics like Bohr, Bethe, Oppenheimer etc."



Why is this book included in the list? Firstly, because it is entertainment coming from a Nobel Prize winning scientist! Of course when you're tired of struggling with maths and physics, you want to have some fun, and if reading happens to be your hobby, this book has numerous hilarious anecdotes from Feynman's personal life.

Second, this book also is motivational in nature. Feynman has continuously reminded his readers that even the idiotic, ordinary or average folk, can go on to achieve great things in life. He has then given valuable tips on how to learn and how to teach physics. So overall, this book is a good read for any physics student.

Top 10 Important Equations In Physics


These simple-looking equations went on to have great consequences and applications in science, society and technology. Let us take a look at the ten most influential formulae in physics (in no particular order) which have changed the course of history.


Second law of motion

The force, often intuitively described as push or pull, is actually the cause of acceleration in a moving particle. Without it coming from any external agency, the particle cannot undergo change in the way it goes. Newton defined the force formally in 1686 in the famous equation, F=ma.

ten most groundbreaking equations in physics

It tells you how powerful an engine has to be in order to pull a car, how much thrust required to lift a rocket, how far a cannonball flies and so on. But more importantly, the equation helped debunk the Aristotelian beliefs which had remained unchallenged for thousands of years.


According to Aristotle, force is necessary to keep an object going. Why otherwise would a ball rolling on the ground eventually stop? Because, Aristotle said, it isn't pushed anymore, that's why.

Then, in the 17th century, Italian scientist Galileo Galilei explained, with experiment, "The ball stopped due to the ground being rough and had it been sufficiently smooth, the ball would roll forever. No force required!"

ten most groundbreaking equations in physics

Newton said further, that the state of rest or uniform linear motion both imply zero acceleration. Thus, the particle will remain in place or keep going at the same rate and it will maintain itself in the state in which it's been until of course when acted upon by external force.


Energy-mass relation

It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing. The mass of a body is a measure of its energy content. If 1 gram of mass is converted into energy, it'd be 90 trillion Joules. This is equal to the energy emitted by a 100 watt light bulb for 30,000 years!


It is important to understand that Einstein's most famous equation is not his major work. The formula is just so well-known because of its association with the atomic bomb. Einstein himself had said, "If I had foreseen Hiroshima and Nagasaki, I would have torn up my formula in 1905," despite him having played a minor role in the Manhattan Project.

Uncertainty principle

Formulated by Werner Heisenberg in 1927, uncertainty principle is one of the cornerstones of quantum mechanics. The equation single-handedly ended the classical determinism, meaning, that in the realm of infinitesimal atoms, chance has its play and the drama of existence is not absolutely predestined in character.

In its most familiar form, it says that the more precise the measurement of position, the more imprecise the measurement of momentum, and vice-versa. Thus, one can never know with perfect accuracy both of those two important factors which determine the movement of one of the smallest particles, its position and its velocity, at the same instant.

ten most groundbreaking equations in physics

The uncertainty principle was immediately rejected by leading physicists of the time, including Albert Einstein. There, Niels Bohr did try his best to convince Einstein that the uncertainty relation is fundamental law in physics. Einstein still refused, and they agreed to disagree. By 1933, the political situation became much worse in Germany, and Einstein moved to the United States.

In 1954, Heisenberg visited Einstein's house in Princeton. They talked only about physics, but Einstein's position on the principle hadn't changed. In 1955, Einstein passed away leaving Werner Heisenberg disheartened that he had failed to get Einstein's endorsement of his uncertainty relation.


Although Einstein and others objected to Heisenberg's and Bohr's views, even Einstein had to admit that they were indeed a logical consequence of quantum mechanics. But for Einstein, something still was missing and the quantum mechanics was incomplete, "I am convinced that god does not throw dice," he claimed metaphorically.

Heisenberg, supported by Bohr, Pauli, Schrödinger and others, maintained until his death that quantum uncertainty is not inaccuracy of the measurement, it is inherent in quantum phenomena. It leads to probabilistic and not deterministic outcomes.


Maxwell-Faraday equation

In 1831, as the story is usually told, the prime minister or some other senior politician was given a demonstration of electromagnetic induction by Faraday. When asked, “What good is it?” Faraday replied: “What good is a newborn baby?” Fifty years passed before electric power really took off as envisioned by Faraday.

ten most groundbreaking equations in physics

Generators and motors both make use of Faraday's Law. The equation by Maxwell became the foundation of power generation hence making Faraday the father of electricity. Maxwell said of Faraday, "He is, and must always remain, the father of that enlarged science of electromagnetism."

Dirac equation

Symmetry is the keyword of physics and Dirac used it perfectly in 1928. He developed an equation that explained spin number as a consequence of the union of quantum mechanics and special relativity. The equation also predicted the existence of anti-matter, previously unsuspected and unobserved, and which was experimentally discovered in 1932.

ten most groundbreaking equations in physics

This accomplishment has been described on par with the works of Newton, Maxwell, and Einstein before him. Dirac even speculated that there may also be mirror universe of anti-particles, thus becoming a source of inspiration for science-fiction writers. Dirac was also equally famous for his contribution to quantum electrodynamics, which described how electric and magnetic forces would work on the scale of things smaller than atoms.


Law of entropy

The famous inequality which says that when energy changes from one form to another form, or when matter moves freely, the disorder in a closed system increases. According to renowned astronomer Arthur Eddington, "The law that entropy always increases, holds, I think, the supreme position among the laws of nature."

ten most groundbreaking equations in physics

The concept of the second law of thermodynamics applies not only to internal combustion engines used in our cars, motorcycles, ships and airplanes but also to explain the processes of life, when considered in terms of cyclic processes.

The second law also has profound consequences for the universe in large scale. Imagine being shown a video clip of a cup being dropped and breaking. You'd clearly be able to tell whether the video was being played backward or forward, from the flow of entropy.

Similarly, if the movie of our universe is played backwards, the universe would be getting more and more ordered, like the cup, and when played forward, we'd expect it getting disordered, like the pieces of broken cup.


Einstein field equations

ten most groundbreaking equations in physics

Einstein's equations led to the fusion of the three dimensions of space and the one dimension of time into a single four-dimensional spacetime. The expression on the left hand side of the equation represents the curvature of spacetime. The expression on the right is the energy density of spacetime. The equation dictates how energy determines the curvature of space and time.

The cosmological constant term (Λ) was introduced by Einstein to allow for a universe that is not expanding or contracting. This effort was unsuccessful because in 1929, astronomer Edwin Hubble discovered evidences for an expanding universe. Einstein was invited by Hubble to see for himself that the universe indeed was changing.

ten most groundbreaking equations in physics

As a result, Einstein abandoned the cosmological constant in the equation, calling it the biggest blunder he ever made. So from the 1930s until the late 1990s, most physicists assumed the cosmological constant to be equal to zero. But, recently improved astronomy techniques have found that the expansion of the universe is accelerating implying the non-zero value of the constant.


Why are the Einstein field equations important in physics? Firstly, because they unify the two concepts of space and time, previously considered separate by the limitations of our intuition, into one spacetime. Just like Maxwell had unified electricity and magnetism into electromagnetism in the 19th century.

Secondly, they describe – not the force – but the fundamental "interaction" of gravitation as a result of spacetime being curved by energy (mass too is energy from Einstein's energy-mass equivalence).

Although Newton did give the formula to calculate the magnitude of gravitational force between any two bodies of mass separated by a distance, he didn't quite explain the cause of gravitation in the first place.


Wave equation

ten most groundbreaking equations in physics

The single-dimensional wave equation has a scalar function (u) of one space variable and one time variable since waves propagate in space, and in time also. This equation was first written by French mathematician Jean le Rond d'Alembert, hence it's sometimes also called the d'Alembert's equation. Swiss mathematician and physicist Leonhard Euler wrote it in three dimensions in 1707.

We are constantly surrounded by waves, whether perceptible to us or not, they are always there. Like when you play a guitar or drop a stone into a pond. The wave equation isn't as elegant as others on this list but it is groundbreaking as it's been applied to sound waves (and instruments), waves in fluids, waves in earthquakes, light waves, quantum mechanics and general relativity.

Planck's equation

This formula is responsible for the birth of quantum mechanics, also television and solar cells. Leading German physicist of the time Max Planck postulated in 1900, that energy was quantised and could be emitted or absorbed only in integral multiples of a small unit, which he called "energy quantum".

ten most groundbreaking equations in physics

Einstein extended Planck's idea in 1905 when he introduced the concept of "light quantum", the particle of light, or photon. Thus, the electromagnetic radiation wasn't continuous like a wave but isolated in the packets of light, Einstein proposed.

Planck had simply introduced the equation as a trick to solve a problem with black body radiation, but Einstein envisioned it to be more. In 1887, experimenter Heinrich Hertz stumbled upon the photoelectric effect for the first time; the emission of electrons when light of specific frequency hit a material.


The phenomenon of photoelectric effect remained largely unexplained, even with the wave theory of light, until the arrival of Planck-Einstein relation in 1905. Einstein described it in terms of particle-particle interaction between the photon and electron. He said, "...below some critical frequency, no photon has enough energy to knock an electron free."

This means that if a photosensitive material requires photons of blue light to emit the electrons, which is the characteristic of the material, then the photons of green or yellow light won't be able to knock the electrons out of the material.

ten most groundbreaking equations in physics

The characteristic energy or work-function of the material is absorbed, to loosen the bonds, and then the remainder of the energy is observed as kinetic energy of the free electron. Einstein's clarification was consistent with the law of conservation of energy. He was recognized with Nobel Prize in physics for his explanation of the photoelectric effect (and not for energy-mass relation or relativity).

Planck said his introduction of "quantum" in 1900 was an act of desperation but when Einstein adopted it and gave it meaning, a whole new debate had started and the old laws were swept away within a decade or so. Einstein who himself was accountable for it refused to endorse the new quantum revolution.

The discovery by Planck and Einstein became the basis of all twentieth-century physics, without which, it would not have been possible to establish a workable theory of molecules and atoms and the energy processes that govern their transformations.


Schrödinger's equation

In his 1924 doctoral thesis, French physicist Louis de Broglie proposed, that just like light has both wave and particle properties, electrons must also possess wave-like properties, in order to support the energy-matter symmetry. Two years later, in 1926, Austrian scientist Erwin Schrödinger published an equation, describing how the matter wave should evolve in space and in time.

ten most groundbreaking equations in physics

Just like Newton's equations are used to calculate how a football behaves when kicked, you use the Schrödinger's equation to calculate the behaviour of electron in the orbit of an atom. More generally, it is used for many calculations in quantum mechanics and is also fundamental to much of the modern technology, from lasers to transistors, and the future development of quantum computers.
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