Definition of Planck's law in English:

Planck's law

Syllabification: Planck's law
Physics
A law, forming the basis of quantum theory, that states that electromagnetic radiation from heated bodies is not emitted as a continuous flow but is made up of discrete units or quanta of energy, the size of which involve a fundamental physical constant (Planck’s constant).
More example sentences
  • It might also be emitting more energy across the electromagnetic spectrum than Planck's law deems possible.
  • This way, semi-classically light comes in little ‘bullets’ with energy given by Planck's law.
  • They [showed] that if the motion of the material particles in a source of light took place according to the laws of classical mechanics, then the correct law of black-body radiation, Planck's law, could not be obtained.

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