Thank you for reporting, we will resolve it shortly
Q.
The star which appears blue must be
NTA AbhyasNTA Abhyas 2022
Solution:
From Wein's displacement law,
$\lambda _{m a x}=\frac{b}{T}$
Also, $\lambda \propto \frac{1}{\nu}$
Therefore, $\nu \propto T,$ $\nu$ is the frequency of the radiation and $T$ is the absolute temperature of source.
Thus, we can say that the blue star is hotter than the white star i.e. the Sun.