 Wien's displacement law

For a blackbody, the wavelength at which $B_{\lambda }(T)$ is largest obeyswhere $b$ is Wien displacement constant.

Wien's displacement law is a fundamental principle in physics, specifically in the study of blackbody radiation. It states that the wavelength at which the emission of a black body spectrum is maximized (or the peak wavelength) is inversely proportional to the absolute temperature of the black body.