Wein’s displacement law The peak of black body spectrum shifts to shorter wavelengths as the temperature of the black body is increased (see fig. p4).

l _max µ 1/T

or l _max T = b= 2.897756 ´ 10^-3 m.K (w6)

Where T is the absolute temperature. The constant, b in equation (w6) is called Wein displacement law constant .Using the Wein’s displacement law temperature of stars can be found by measuring l _max in their spectrum.