Planck's law

describes the amount of spectral radiance at a certain wavelength radiated by a black body cavity in thermal equilibrium
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Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T. The law is named after Max Planck, who proposed it in 1900. It is a pioneering result of modern physics and quantum theory.

Planck's law (colored curves) accurately described black body radiation

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