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A law, forming the basis of quantum theory, which 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).
‘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.’
‘It might also be emitting more energy across the electromagnetic spectrum than Planck's law deems possible.’
‘You will see that I have tried to deduce the coefficient in Planck's law independent of classical electrodynamics.’
‘The year 1926 saw the complete solution of the derivation of Planck's law after 26 years.’
‘This way, semi-classically light comes in little ‘bullets’ with energy given by Planck's law.’