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What will be the average value of energy...

What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature T ? `(k_B` is Boltzmann constant)

A

`3/2 k_B T`

B

`1/2 k_B T`

C

`2/3 k_B T`

D

`k_B T`

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