Thermal Properties of Matter - Result Question 16

16. 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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(a) TP>TR>TQ

(b) T P<TR<TQ

(c) TP<TQ<TR

(d) TP>TQ>TR

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Answer:

Correct Answer: 16. (a)

Solution:

  1. (a) From Wein’s displacement law

λm×T= constant

P max. intensity is at violet

λm is minimum temp maximum

Rmax. 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



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