Q. On investigation of light from three different stars $A,B$ and $C$, it was found that in the spectrum of $A$ the intensity of red colour is maximum, in $B$ the intensity of blue colour is maximum and in $C$ the intensity of yellow colour is maximum. From these observations it can be concluded that
A) The temperatures of $A$ is maximum, $B$ is minimum and $C$ is intermediate
B) The temperatures of $A$ is maximum, $C$ is minimum and $B$ is intermediate
C) The temperatures of $B$ is maximum, $A$ is minimum and $C$ is intermediate
D) The temperatures of $C$ is maximum, $B$ is minimum and $A$ is intermediate
Explanation
(c) According to Wien’s law, $\lambda_{m}T =$ constant
$\lambda_{r} > \lambda_{y} > \lambda_{b} \Rightarrow T_{r} < T_{y}$ or $T_{A} < T_{C} < T_{B}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.