First slide
Radiation
Question

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  TP,TQ and TR are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that

Easy
Solution

According to Wein's displacement law 

λmT= constant                   . . . .(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.

 Also, λr>λg>λv Using equation (i), Tr<Tg<Tv   TQ<TR<TP

 

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