Wien's Law of Radiation

Wien’s Law of Radiation


a law of the distribution of energy in a spectrum of equilibrium radiation (radiation from an absolute blackbody) depending on the temperature.

This law was set forth in theory by W. Wien in 1893. According to the law, the density energy of radiation Uv, which corresponds to the frequency of radiation v, depends on v and the absolute temperature T as follows:

uv = v3f(v/T)

where f is a certain function of the ratio v/T. Wien’s dis-placement law may be derived from this law. In 1896, Wien obtained the following dependence for uv

uv = c1v3ectv/T

where c1 and c2 are constant coefficients. This law represents a limiting case of Planck’s law of radiation, and it is valid at great frequencies of radiation (short wavelengths).