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C(v) value of He is always 3R//2 but C(v...

`C_(v)` value of He is always `3R//2` but `C_(v)` value of `H_(2)` is `3R//2` at low temperature and `5R//2` at moderate temperature and more than `5R//2` at higher temperature. Explain in two or three lines.

A

Hydrogen is diatomic so at high temperature rotational and vibrational motion also counts

B

Hydrogen is monoatomic so at high temperature rotational and vibrational motion also counts

C

Hydrogen is diatomic so at high temperature rotational and vibration motion are not counted

D

Cann't defined

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