Sun emits maximum radiant energy at 5461A and Moon at 10`mu`m. If the surface temperature of Sun is 5890 K, then find that of the Moon.

Explanation

Given, `lamda_1=5.461xx10^(-7)m`
`lamda_2=10xx10^6m" "T_1=5.89xx10^3k" "T_2`=?
Applying Wien's law,
`lamda_1T_1=lamda_2T_2` we get,
`T_2=(lamda_1T_1)/(lamda_2)=(5.461xx10^(-7)xx5.89xx10^(3))/(10xx10^(5))=321.6K`