Wien's Displacement Law

a law that asserts that the length λ_max of a wave that receives the most energy in an equilibrium spectrum is inversely proportional to the absolute temperature T of the radiating body: λ_max T = b, where b is a constant equal to 0.2897 cnv°K. Wien’s displacement law indicates how the maximum in an energy distribution is displaced within the radiation spectrum of a blackbody in case of a change in temperature. The law was first derived by W. Wien in 1893 on the basis of thermodynamic observations.