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WordReference Random House Unabridged Dictionary of American English © 2024Planck's′ radia′tion law′, [Physics.]- Physicsthe 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.
- Physicsthe law giving the spectral distribution of radiation from a blackbody. Also called Planck′ radia′tion for′mula, Planck's′ law′.
- named after M. K. English. Planck 1905–10
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