| 单词 | quantum of action |
| 释义 | > as lemmasquantum of action b. More fully quantum of action. = Planck's constant n. at Planck n. 1d. ΘΚΠ the world > matter > physics > electromagnetic radiation > [noun] > quantity of > Planck's constant H1901 Planck's constant1910 quantum of action1913 Planck's quantum1914 1913 London, Edinb. & Dublin Philos. Mag. 6th Ser. 26 2 Whatever the alteration in the laws of motion of the electrons may be, it seems necessary to introduce..a quantity foreign to the classical electrodynamics, i.e. Planck's constant, or as it often is called the elementary quantum of action. 1922 Rep. Brit. Assoc. Advancem. Sci. 1921 473 The essential feature of the [quantum] theory is the existence of a universal constant, the quantum h = 6·55 × 10−27 erg sec., which in some way..controls exchanges of energy. 1933 Nature 25 Mar. 422/2 A causal description in the classical sense is possible only in such cases where the action involved is large compared with the quantum of action. 1956 E. H. Hutten Lang. Mod. Physics v. 179 We can measure simultaneous values of both parameters only in such a way that the numerical product of their inaccuracies is, at best, equal to the quantum of action h. 2004 C. Norris Philos. of Lang. v. 118 This is not to say that Planck's quantum of action h necessarily marks the advent of a new and unprecedented stage in the evolution of physics. < as lemmas |
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