Wien’s Displacement Law

The Wien’s Displacement Law states that a black body having a wavelength (λmax) carrying the maximum energy is inversely proportional to the absolute temperature (T).

λmax * T = b

Where, λmax  =  Wavelength of maximum intensity in meters,
T  =  Temperature of the black body in kelvins,

Weins Displacement law graph of power density vs wavelength

Image Credits: Hyperphysics

b  = Wien’s displacement constant  =  2.898 × 10-3 meter.kelvins

Wien’s Displacement law equation is useful for the find the temperatures of hot radiant bodies such as stars and used for a finding of the temperature of any radiant object which is far above that of its surroundings.

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