On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that
According to Wein's displacement law
. . . .(i)
For star P, intensity of violet colour is maximum
For star Q, intensity of red colour is maximum.
For star R, intensity of green colour is maximum.