If λm  denotes the wavelength at which the radiative emission from a black body at a temperature T K is maximum, then

According to Wien's displacement law, the wavelength (λm) of maximum intensity of emission of black body radiation is inversel proporitonal to absolute temperature (T) of the black body. Therefore, Wien's law is            λmT = constant   or  λm = constantT    or λm∝1T   or λm ∝ T-1