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