Question

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 temperature of A is maximum, B is minimum and C is intermediate
• B. The temperature of A is maximum, C is minimum and B is intermediate
• C. The temperature of B is maximum, A is minimum and C is intermediate
• D. The temperature of C is maximum, B is minimum and A is intermediate

Answer 1

Answer: (C)

The temperature of B is maximum, A is minimum and C is intermediate

Answer 2

According to Wein’s law, $\lambda_{m}T =$constant

$\lambda_{r} > \lambda_{y} > \lambda_{b} \Rightarrow T_{r} < T_{y} < T_{b}$ or $T_{A} < T_{C} < T_{B}$