Wien Displacement Law

For a blackbody, the product of the wavelength corresponding to the maximum radiancy and the thermodynamic temperature is a constant, the Wien displacement law constant. As a result, as the temperature rises, the maximum of the radiant energy shifts toward the shorter wavelength (higher frequency and energy) end of the spectrum.

Wien displacement law constant,
b = 2.8977686x10-3 m K

For the sun, whose surface temperature is 5800 K, the peak wavelength is about 0.5 Ám. The law can be used to infer the temperature of a star from its spectral distribution.

See also: Blackbody.

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Subjects: Physics