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Diatomic molecules like hydrogen have en...

Diatomic molecules like hydrogen have energies due to both translational as well as rotational motion. From the equation in kinetic theory `pV = 2/3 E,E` is

A

(a) the total energy per unit volume

B

(b) only the translational part of energy because rotational energy is very small compared to the translational energy.

C

(c) only the translational part of the energy because during collisions with the wall pressure relates to change in linear momentum.

D

(d) the translational part of the energy because rotational energies of molecules can be of either sign and it average over all the molecules is zero.

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