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Planck’s law holds good for

Planck's law states that the quantum of energy, E, associated with an electromagnetic field is given by E = h , where h is Planck's constant and is the frequency of the electromagnetic radiation. Planck’s law holds good for the black body.

The primary law governing blackbody radiation is the Planck Radiation Law, which governs the intensity of radiation emitted by unit surface area into a fixed direction from the blackbody as a function of wavelength for a fixed temperature.