(Wien's law: )
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A black body is a theoretical object that absorbs all wavelengths of radiation. When an object is heated up, it emits light, so black-body radiation is the wavelengths of light a black body emits when heated up. Observation of black-body radiation has shown that the intensity of the radiation emitted increases at a rate of a constant times temperature ^ 4, and that the wavelength of maximum intensity is inversely proportional to temperature.
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