Diatomic molecules like hydrogen haven energy due to both translational as well as rotational motion. From the equation in kinetic theory `PV=(2)/(3)E,E` is

Options

A. the total energy per unit volume.
B. only the translational part of energy because rotational energy is very small compared to the translational energy.
C. only the translational part of the energy because during collisions with the walls, pressure relates to change in linear momentum.
D. The translational part of the energy because rotational energies of molecules can be of either sign and its average over all the molecules is zero.

Answer

C

Explanation

As is known from theory in the relation `pV = 2/3 E`, E is only the translational part of energy of molecules. This is because during collision of molecules with the walls, exerted relates to change in linear momentum of gas molicules.