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Wiens displacement law _ What are the laws of radiation _ Stefan boltzmann law _ Wiens law Wien's displacement law states that the peak wavelength of a blackbody's radiation is inversely proportional to its temperature, while the Stefan-Boltzmann law states that the total energy radiated by a blackbody is proportional to the fourth power of its temperature. These are two fundamental laws of blackbody radiation, which describes the spectrum of electromagnetic radiation emitted by an ideal object