If wavelength of maximum intensity of radiation emitted by Sun and Moon are $0.5 \times 10^{-4} \,m$ and $10^{-4}\,m$ respectively, then the ratio of their temperature is ............
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(d)
$\lambda_m T_1=$ Constant [Wien's law]
$\Rightarrow \lambda_1 T_1=\lambda_2 T_2$
$0.5 \times 10^{-8} \times T_1=10^{-4} \times T_2$
$\frac{T_1}{T_2}=200$
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