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Planck's constantOne entry found. Main Entry: Planck's constant Pronunciation: \ˈpläŋ(k)s-, ˈplaŋ(k)s-\ Function: noun Etymology: Max K. E. L. Planck Date: 1910 : a constant that gives the unvarying ratio of the energy of a quantum of radiation to its frequency and that has an approximate value of 6.626 × 10−34 J·s —symbol h
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