Planck's constant

noun
\ˈpläŋ(k)s-, ˈplaŋ(k)s- \

Definition of Planck's constant 

: 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

First Known Use of Planck's constant

1910, in the meaning defined above

History and Etymology for Planck's constant

Max K. E. L. Planck

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The first known use of Planck's constant was in 1910

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Planck's constant

noun
\ˈplaŋ(k)s-, ˈpläŋ(k)s- \

Medical Definition of Planck's constant 

: 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 joule second symbol h

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