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At ordinary temperatures, the molecules ...

At ordinary temperatures, the molecules of an ideal gas have only translational and rotational kinetic energies. At high temperatures they may also have vibrational energy.
As a result of this, at higher temperature

A

`C_v=3R//2` for monatomic gas

B

`C_v gt R//2` for monoatomic gas

C

`C_v lt 5R//2` for diatomic gas

D

`C_v gt 5R//2` for diatomic gas

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