Planck's Constant Definition

plängks
noun
A universal constant (h) which gives the ratio of a quantum of radiant energy (E) to the frequency (ν) of its source: it is expressed by the equation E = hν, and its approximate numerical value is 6.626 × 10-34 joule second.
Webster's New World
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Origin of Planck's Constant

  • Named for Max Planck (1858-1947), German theoretical physicist, who discovered it in 1900.

    From Wiktionary

  • After Max Karl Ernst Ludwig Planck

    From American Heritage Dictionary of the English Language, 5th Edition

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