At absolute zero temperature, the kinetic energy of gas molecules theoretically becomes:

For a diatomic gas change in internal energy for unit change in temperature for constant volume is ${U_1}$ and ${U_2}$ respectively. ${U_1}:{U_2}$ is

An ideal gas has molecules with 5 degrees of freedom. The ratio of specific heats at constant pressure $\left( {{C_P}} \right)$ and at constant volume $\left( {{C_V}} \right)$ is:

For a diatomic gas change in internal energy for unit change in temperature for constant volume is ${U_1}$ and ${U_2}$ respectively. ${U_1}:{U_2}$ is