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 temperature of P, Q and R, then it can be concluded
from the above observations that [2015]
(a) TP > TR > TQ (b) TP < TR < TQ
(c) TP < TQ < TR (d) TP > TQ > TR

Answer 1

Answer:

a) TP>TR>TQ

What is your answer?

Answer 2

According to Wein's displacement law λm T = constant For star P, intensity of violet colour is maximum For star Q, intensity of red colour is maximum.

from wein displacement law

λ m

T=bλ m

α T1

The wavelength of red is maximum hence, temperature of Q T

Q will be least , and wavelength of violet is minimum and the temperature of P T

P will be highest, and temperature of green T

R light will lie between P and Q

$\huge \tt \underline \orange { T P >T R >T Q }$