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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 temperature of P, Q and R, then it can be concluded from the above observations that
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- TP > TR > TQ
- TP < TR < TQ
- TP < TQ < TR
- TP > TQ > TR
Correct Option: A
From Wein’s displacement law
λm × T = constant
P – max. intensity is at violet
⇒ λm is minimum ⇒ temp maximum
R – max. intensity is at green
⇒ λm is moderate ⇒ temp moderate
Q – max. intensity is at red ⇒ λm is maximum
⇒ temp. minimum i.e., Tp > TR > TQ
