Planck's' radia'tion law"

1. the law that energy associated with electromagnetic radiation, as light, is composed of discrete quanta of energy, each quantum equal to Planck's constant times the corresponding frequency of the radiation: the fundamental law of quantum mechanics.
2. the law giving the spectral distribution of radiation from a blackbody. Also called Planck' radia'tion for"mula, Planck's' law'.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Planck's constantplane
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