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1. (n.) Planck's constant
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 &xtimes; 10-34 joule second.
Etymology: (1905–10; after M. K. E. Planck)
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| Definition of 'planck's constant' |
Princeton's WordNet |
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1. (noun) Planck's constant, h
the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
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Definitions of planck's constant 
