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Properties of Matter question

2015 · Q149
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Properties of Matter question

2015 · Q149

NEETPhysicsProperties of MatterMCQ+4 / −1
On observing light from three different starts 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 conclued from the above observations that
  1. A
    TP < TR < TQ
  2. B
    TP < TQ < TR
  3. C
    TP > TQ > TR
  4. D
    TP > TR > TQ
View written solutionFree

Correct answer: D

According to Wein’s displacement law

λmT{\lambda _m}Tλm​T = 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{\lambda _r} \gt {\lambda _g} \gt {\lambda _v}λr​>λg​>λv​

Using equation (i), Tr < Tg < Tv

TQ < TR < TP

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