What will be the ratio of rate of radiation of metal sphere at two different temperatures $T_1 = 527^\circ$C and $T_2 = 127^\circ$C

The coefficient of thermal conductivity of a metal rod depends on its

A sample of gas at temperature $T$ is adiabatically expanded to double its volume. The work done by the gas in the process is (given, $\gamma = \dfrac{3}{2}$):

Energy of a gas/litre is $600$ joule, then what will be its pressure?