From one piece The Genesis and Present State of Development of the Quantum Theory (Nobel Lecture, 2 June 1920) 12 beliefs, in the piece's order there
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Although only entropy differences are measured, it is useful to define an absolute value of entropyTheir words
Nevertheless, it is useful to introduce the suitably defined absolute value of entropy, namely for the reason that with its help certain general laws can be particularly easily formulated.
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The harder the quantum problem proves, the more it will deepen our knowledge of physicsTheir words
the greater the difficulties which oppose its solution, the more significant it finally will show itself to be for the broadening and deepening of our whole knowledge in physics.
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Science will master the quantum dilemma, and what looks unsatisfactory now will prove harmonious and simpleTheir words
Be that as it may, in any case no doubt can arise that science will master the dilemma, serious as it is, and that which appears today so unsatisfactory will in fact eventually, seen from a higher vantage point, be distinguished by its special harmony and simplicity.
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The main principles of classical thermodynamics will probably survive the quantum and be extendedTheir words
all the signs suggest that the main principles of thermodynamics from the classical theory will not only rule unchallenged but will more probably become correspondingly extended.
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The quantum has made it obvious that the old framework of classical physics must be burst asunderTheir words
today it has become obvious that the old framework must somehow or other be burst asunder.
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Bohr's atom rests on hypotheses every physicist would have flatly rejected a generation agoTheir words
What serves in Bohr’s theory as a basis to build up the laws of action, is assembled out of specific hypotheses which, up to a generation ago, would undoubtedly have been flatly rejected altogether by every physicist.
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To be sure, the introduction of the quantum of action has not yet produced a genuine quantum theory.
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there is no other decision left for a critic who does not intend to resist the facts, than to award to the quantum of action, which by each different process in the colourful show of processes, has ever-again yielded the same result, namely, 6.52 x 10-27 erg sec, for its magnitude, full citizenship in the system of universal physical constants.
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Experiment, and the researchers who used the quantum of action, settled that it is real, not his own derivationTheir words
That the decision could be made so soon and so definitely was due not to the proving of the energy distribution law of heat radiation, still less to the special derivation of that law devised by me, but rather should it be attributed to the restless forwardthrusting work of those research workers who used the quantum of action to help them in their own investigations and experiments.
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A researcher's work would seem hopeless without occasional striking facts showing a step nearer the truthTheir words
And the whole strenuous intellectual work of an industrious research worker would appear, after all, in vain and hopeless, if he were not occasionally through some striking facts to find that he had, at the end of all his criss-cross journeys, at last accomplished at least one step which was conclusively nearer the truth.
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An indispensable hypothesis, even though still far from being a guarantee of success, is however the pursuit of a specific aim, whose lighted beacon, even by initial failures, is not betrayed.
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I held the unshakeable opinion that the simpler the presentation of a particular law of Nature, the more general it is