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Max Planck discovers Planck's law of black-body radiation.
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Max Planck
German theoretical physicist (1858–1947)
Max Karl Ernst Ludwig Planck was a German theoretical physicist whose discovery of energy quanta won him the Nobel Prize in Physics in 1918.Source: Wikipedia (CC BY-SA)
Planck's law
Spectral density of light emitted by a black body
In physics, Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T, when there is no net flow of matter or energy between the body and its environment.Source: Wikipedia (CC BY-SA)