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Richard Philips Feynman foi um físico norte-americano do século XX, um dos pioneiros da eletrodinâmica quântica, e Nobel de Física de 1965. É irmão mais velho da astrofísica Joan Feynman.

✵ 11. Maio 1918 – 15. Fevereiro 1988  •  Outros nomes Richard Feynman Philips, Richard Phillips Feynman, Ричард Филлипс Фейнман
Richard Feynman photo
Richard Feynman: 192 citações23 Curtidas

Richard Feynman Frases famosas

“A filosofia da ciência é tão útil para o cientista quanto a ornitologia para os pássaros”

Richard Feynman

Richard Feynman, conforme relatado por Singh, Simon - Big Bang - Editora Record - Rio de Janeiro / São Paulo - 2006. ISBN: 85-01-07213-3 (pág. 459)

“Posso dizer seguramente que ninguém entende a física quântica.”

Richard Feynman livro The Character of Physical Law

I think I can safely say that nobody understands quantum mechanics
The Character of Physical Law (1965) Ch. 6; MIT Press, 1967

“Existem cerca de 1011 estrelas na galáxia. Esse já foi considerado um número grande. Mas é apenas cem bilhões. É menos que a dívida interna! Antigamente, estes números eram chamados de números astronômicos. Agora, deveríamos chamá-los de números econômicos.”

Richard Feynman

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“Nossa liberdade de duvidar da autoridade científica não existia nos primórdios da ciência. Foi uma batalha difícil até nos permitirem questionar, duvidar ou não estar seguros. Eu acredito que é importante não esquecermos desta batalha e virmos por perder um dia o que nós conquistamos.”

Richard Feynman

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“Não devemos dizer à natureza o que ela deve ser... Ela sempre tem uma imaginação melhor que a nossa.”

Richard Feynman

“Os poetas reclamam que a ciência retira a beleza das estrelas. Mas eu posso vê-las de noite no deserto, e senti-las. Vejo menos ou mais?”

Richard Feynman livro The Feynman Lectures on Physics

Poets say science takes away from the beauty of the stars — mere globs of gas atoms. Nothing is "mere". I too can see the stars on a desert night, and feel them. But do I see less or more?
The Feynman Lectures on Physics: Mainly Mechanics, Radiation, and Heat‎, de Richard Phillips Feynman, Robert B. Leighton, Matthew L. Sands - Publicado por Addison-Wesley, 1963

Richard Feynman frases e citações

“A Física está para a Matemática como o sexo está para a masturbação.”

Richard Feynman

Physics is to mathematics what sex is to masturbation
Richard Feynman citado em "Physically speaking: a dictionary of quotations on physics and astronomy"‎ - Página 215, Carl C. Gaither, Alma E. Cavazos-Gaither - CRC Press, 1997, ISBN 0750304707, 9780750304702 - 492 páginas

“Se você acha que entendeu alguma coisa sobre mecânica quântica, então é porque você não entendeu nada.”

Richard Feynman

If you think you understand quantum mechanics, you don't understand quantum mechanics.
citado em "Armageddon now: the end of the world A to Z‎" - Página 337, Jim Willis, Barbara Willis - Visible Ink Press, 2005, ISBN 0780809238, 9780780809239 - 450 páginas
Atribuídas

“Para uma tecnologia de sucesso, a realidade deve ter prioridade sobre as relações públicas, pois a Natureza não pode ser enganada.”

Richard Feynman

“Os cientistas devem vestir a camisa de força do materialismo, caso contrário, não é possível fazer ciência.”

Richard Feynman

“A ideia é fornecer todas as informações, para que os outros possam julgar o valor de sua contribuição, e não apenas as informações que dirijam o julgamento para uma direção específica.”

Richard Feynman

Sobre escolhas seletivas na investigação científica.
como citado por Ben Goldacre em Ciência picareta; tradução de Renato Rezende, Rio de Janeiro: Civilização Brasileira, 2015, versão kindle, posição 1879.
Atribuídas

Richard Feynman: Frases em inglês

“Science alone of all the subjects contains within itself the lesson of the danger of belief in the infallibility of the greatest teachers of the preceding generation.”

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Richard Feynman

address " What is Science? http://www.fotuva.org/feynman/what_is_science.html", presented at the fifteenth annual meeting of the National Science Teachers Association, in New York City (1966), published in The Physics Teacher, volume 7, issue 6 (1969), p. 313-320

“Science is the belief in the ignorance of experts.”

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Richard Feynman

address " What is Science? http://www.fotuva.org/feynman/what_is_science.html", presented at the fifteenth annual meeting of the National Science Teachers Association, in New York City (1966), published in The Physics Teacher, volume 7, issue 6 (1969), p. 313-320

“We have a habit in writing articles published in scientific journals to make the work as finished as possible, to cover all the tracks, to not worry about the blind alleys or to describe how you had the wrong idea first, and so on. So there isn't any place to publish, in a dignified manner, what you actually did in order to get to do the work.”

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Richard Feynman

"The Development of the Space-Time View of Quantum Electrodynamics," Nobel Lecture http://nobelprize.org/physics/laureates/1965/feynman-lecture.html (11 December 1965)

“The theoretical broadening which comes from having many humanities subjects on the campus is offset by the general dopiness of the people who study these things.”

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Richard Feynman

letter to Robert Bacher (6 April 1950), quoted in Genius: The Life and Science of Richard Feynman (1992) by James Gleick, p. 278

“So we have these wide principles which sweep across all the different laws, and if one takes too seriously its derivations, and feels that this is only valid because this [assumed more fundamental principle] is valid, you cannot understand the interconnections of the different branches of physics. Some day, when physics is complete, then maybe with this kind of argument we'll know all the laws, then we can start with some axioms (and no doubt somebody will figure out a particular way of doing it) and then all the deductions will be made. But while we don't know all the laws, we can use some to make guesses at theorems which extend beyond the proof.”

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Richard Feynman livro The Character of Physical Law

Fonte: The Character of Physical Law (1965), chapter 2, “The Relation of Mathematics to Physics”

“There are many interesting phenomena … which involve a mixture of physical phenomena and physiological processes, and the full appreciation of natural phenomena, as we see them, must go beyond physics in the usual sense. We make no apologies for making these excursions into other fields, because the separation of fields, as we have emphasized, is merely a human convenience, and an unnatural thing. Nature is not interested in our separations, and many of the interesting phenomena bridge the gaps between fields.”

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Richard Feynman

volume I; lecture 35, "Color Vision"; 35-1 "The human eye"; p. 35-1
The Feynman Lectures on Physics (1964)

“Do not keep saying to yourself, if you can possibly avoid it, "But how can it be like that?" because you will get "down the drain", into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that.”

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Richard Feynman livro The Character of Physical Law

Concerning the apparent absurdities of quantum behavior.
chapter 6, “Probability and Uncertainty — the Quantum Mechanical View of Nature,” p. 129
The Character of Physical Law (1965)

“It is impossible, by the way, when picking one example of anything, to avoid picking one which is atypical in some sense.”

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Richard Feynman livro The Character of Physical Law

Fonte: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 27: video http://www.youtube.com/watch?v=j3mhkYbznBk&t=37m16s

“Hell, if I could explain it to the average person, it wouldn't have been worth the Nobel prize.”

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Richard Feynman

statement (c. 1965), quoted in " An irreverent best-seller by Nobel laureate Richard Feynman gives nerds a good name http://www.people.com/people/article/0,,20091337,00.html", People Magazine (22 July 1985)

“We cannot define anything precisely. If we attempt to, we get into that paralysis of thought that comes to philosophers, who sit opposite each other, one saying to the other, "You don't know what you are talking about!". The second one says, "What do you mean by know? What do you mean by talking?”

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Richard Feynman

What do you mean by you?"
volume I; lecture 8, "Motion"; section 8-1, "Description of motion"; p. 8-2
The Feynman Lectures on Physics (1964)

“It's a great game to try to look at the past, at an unscientific era, look at something there, and say have we got the same thing now, and where is it? So I would like to amuse myself with this game. First, we take witch doctors. The witch doctor says he knows how to cure. There are spirits inside which are trying to get out. … Put a snakeskin on and take quinine from the bark of a tree. The quinine works. He doesn't know he's got the wrong theory of what happens. If I'm in the tribe and I'm sick, I go to the witch doctor. He knows more about it than anyone else. But I keep trying to tell him he doesn't know what he's doing and that someday when people investigate the thing freely and get free of all his complicated ideas they'll learn much better ways of doing it. Who are the witch doctors? Psychoanalysts and psychiatrists, of course.”

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Richard Feynman livro The Meaning of It All

lecture III: &quot;This Unscientific Age&quot; <br class="br">David Goodstein reports http://www.americanscientist.org/bookshelf/pub/feynmaniacs-should-read-this-review-skip-lecture-collection-save-22-simoleons that the entire psychology department walked out in a huff at this point. <br class="br">The Meaning of It All (1999)

“People are always asking for the latest developments in the unification of this theory with that theory, and they don't give us a chance to tell them anything about what we know pretty well. They always want to know the things we don't know.”

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Richard Feynman livro QED: The Strange Theory of Light and Matter

Fonte: QED: The Strange Theory of Light and Matter (1985), p. 3

“I'd hate to die twice. It's so boring.”

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Richard Feynman

last words (15 February 1988), according to James Gleick, in Genius: The Life and Science of Richard Feynman (1992), p. 438

“The scale of light can be described by numbers — called the frequency — and as the numbers get higher, the light goes from red to blue to ultraviolet. We can't see ultraviolet light, but it can affect photographic plates. It's still light — only the number is different.”

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Richard Feynman livro QED: The Strange Theory of Light and Matter

Fonte: QED: The Strange Theory of Light and Matter (1985), p. 13

“For those who want some proof that physicists are human, the proof is in the idiocy of all the different units which they use for measuring energy.”

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Richard Feynman livro The Character of Physical Law

Fonte: The Character of Physical Law (1965), chapter 3, “The Great Conservation Principles,” p. 75

“The first one has to do with whether a man knows what he is talking about, whether what he says has some basis or not. And my trick that I use is very easy. If you ask him intelligent questions — that is, penetrating, interested, honest, frank, direct questions on the subject, and no trick questions — then he quickly gets stuck. It is like a child asking naive questions. If you ask naive but relevant questions, then almost immediately the person doesn't know the answer, if he is an honest man.”

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Richard Feynman livro The Meaning of It All

lecture III: "This Unscientific Age"
The Meaning of It All (1999)

“If we are to replace standard numerical probability usage with engineering judgment, why do we find such an enormous disparity between the management estimate and the judgment of the engineers? It would appear that, for whatever purpose, be it for internal or external consumption, the management of NASA exaggerates the reliability of its product, to the point of fantasy.”

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Richard Feynman

Rogers Commission Report (1986)

“It requires a much higher degree of imagination to understand the electromagnetic field than to understand invisible angels. … I speak of the E and B fields and wave my arms and you may imagine that I can see them … [but] I cannot really make a picture that is even nearly like the true waves.”

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Richard Feynman

volume II; lecture 20, "Solution of Maxwell's Equations in Free Space"; section 20-3, "Scientific imagination"; p. 20-9 to 20-10
The Feynman Lectures on Physics (1964)

“This is the key of modern science and is the beginning of the true understanding of nature. This idea. That to look at the things, to record the details, and to hope that in the information thus obtained, may lie a clue to one or another of a possible theoretical interpretation.”

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Richard Feynman livro The Character of Physical Law

Fonte: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 15: video http://www.youtube.com/watch?v=j3mhkYbznBk&amp;t=12m45s

“I returned to civilization shortly after that and went to Cornell to teach, and my first impression was a very strange one. I can't understand it any more, but I felt very strongly then. I sat in a restaurant in New York, for example, and I looked out at the buildings and I began to think, you know, about how much the radius of the Hiroshima bomb damage was and so forth… How far from here was 34th street?… All those buildings, all smashed — and so on. And I would go along and I would see people building a bridge, or they'd be making a new road, and I thought, they're crazy, they just don't understand, they don't understand. Why are they making new things? It's so useless. But, fortunately, it's been useless for almost forty years now, hasn't it? So I've been wrong about it being useless making bridges and I'm glad those other people had the sense to go ahead.”

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Richard Feynman

On his emotional reaction after the first uses of the atomic bomb.
Part 3: "Feynman, The Bomb, and the Military", "Los Alamos from Below", p. 136
Surely You're Joking, Mr. Feynman! (1985)

“[John] von Neumann gave me an interesting idea: that you don't have to be responsible for the world that you're in. So I have developed a very powerful sense of social irresponsibility as a result of von Neumann's advice. It's made me a very happy man ever since. But it was von Neumann who put the seed in that grew into my active irresponsibility!”

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Richard Feynman

Part 3: "Feynman, The Bomb, and the Military", "Los Alamos from Below", p. 132
Surely You're Joking, Mr. Feynman! (1985)

“Each piece, or part, of the whole of nature is always merely an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected. … The test of all knowledge is experiment. Experiment is the sole judge of scientific “truth.””

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Richard Feynman

volume I; lecture 1, "Atoms in Motion"; section 1-1, "Introduction"; p. 1-1
The Feynman Lectures on Physics (1964)

“There are those who are going to be disappointed when no life is found on other planets. Not I — I want to be reminded and delighted and surprised once again, through interplanetary exploration, with the infinite variety and novelty of phenomena that can be generated from such simple principles. The test of science is its ability to predict. Had you never visited the earth, could you predict the thunderstorms, the volcanoes, the ocean waves, the auroras, and the colorful sunset? A salutary lesson it will be when we learn of all that goes on on each of those dead planets — those eight or ten balls, each agglomerated from the same dust cloud and each obeying exactly the same laws of physics.”

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Richard Feynman

volume II; lecture 41, "The Flow of Wet Water"; section 41-6, "Couette flow"; p. 41-12
The Feynman Lectures on Physics (1964)

“This conference was worse than a Rorschach test: There's a meaningless inkblot, and the others ask you what you think you see, but when you tell them, they start arguing with you!”

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Richard Feynman

Part 5: "The World of One Physicist", "Is Electricity Fire?", p. 283
Surely You're Joking, Mr. Feynman! (1985)

“Physics is to mathematics what sex is to masturbation.”

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Richard Feynman

quoted in Lawrence M. Krauss, Fear of Physics: A Guide for the Perplexed (1993), p. 27

“I have to understand the world, you see.”

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Richard Feynman

Part 4: "From Cornell to Caltech, With A Touch of Brazil", "Certainly, Mr. Big!", p. 231
Surely You're Joking, Mr. Feynman! (1985)

“What do we mean by “understanding” something? We can imagine that this complicated array of moving things which constitutes “the world” is something like a great chess game being played by the gods, and we are observers of the game. We do not know what the rules of the game are; all we are allowed to do is to watch the playing. Of course, if we watch long enough, we may eventually catch on to a few of the rules. The rules of the game are what we mean by fundamental physics. Even if we knew every rule, however, we might not be able to understand why a particular move is made in the game, merely because it is too complicated and our minds are limited. If you play chess you must know that it is easy to learn all the rules, and yet it is often very hard to select the best move or to understand why a player moves as he does. So it is in nature, only much more so.”

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Richard Feynman

volume I; lecture 2, "Basic Physics"; section 2-1, "Introduction"; p. 2-1
The Feynman Lectures on Physics (1964)

“Jiry, don't worry about anything. Go out and have a good time.”

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Richard Feynman

Fonte: No Ordinary Genius (1994), p. 252, last words to his artist friend Jirayr Zorthian, as recalled by Zorthian in &quot;No Ordinary Genius&quot; (1993): video http://www.youtube.com/watch?v=Fzg1CU8t9nw&amp;t=1h33m22s

“One of the first interesting experiences I had in this project at Princeton was meeting great men. I had never met very many great men before. But there was an evaluation committee that had to try to help us along, and help us ultimately decide which way we were going to separate the uranium. This committee had men like Compton and Tolman and Smyth and Urey and Rabi and Oppenheimer on it. I would sit in because I understood the theory of how our process of separating isotopes worked, and so they'd ask me questions and talk about it. In these discussions one man would make a point. Then Compton, for example, would explain a different point of view. He would say it should be this way, and he was perfectly right. Another guy would say, well, maybe, but there's this other possibility we have to consider against it.

So everybody is disagreeing, all around the table. I am surprised and disturbed that Compton doesn't repeat and emphasize his point. Finally at the end, Tolman, who's the chairman, would say, "Well, having heard all these arguments, I guess it's true that Compton's argument is the best of all, and now we have to go ahead."

It was such a shock to me to see that a committee of men could present a whole lot of ideas, each one thinking of a new facet, while remembering what the other fella said, so that, at the end, the decision is made as to which idea was the best -- summing it all up -- without having to say it three times. These were very great men indeed.”

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Richard Feynman

from the First Annual Santa Barbara Lectures on Science and Society, University of California at Santa Barbara (1975)

“There was no way, without full understanding, that one could have confidence that conditions the next time might not produce erosion three times more severe than the time before. Nevertheless, officials fooled themselves into thinking they had such understanding and confidence, in spite of the peculiar variations from case to case. A mathematical model was made to calculate erosion. This was a model based not on physical understanding but on empirical curve fitting.”

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Richard Feynman

Rogers Commission Report (1986)

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