Plancks constant

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Related to Plancks constant: Reduced planck's constant


(or Planck′) con′stant,

a unit used in quantum mechanics that equals the ratio of the energy of a quantum of radiation to the frequency of the radiation, approximately 6.626 x 10-34 joule second. Symbol: h
[1905–10; after M. K. E. Planck]
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