Question: In point e ) where we need to calculate C _ l we first need to get the internal energy U . I am not

In point e) where we need to calculate C_l we first need to get the internal energy U. I am not convinced that U=NkT in the solution provided by the expert. I think it should be U=(1/2)NkT, since in this one-dimensional case molecules have only one degree of freedom and for ideal gas U=f*(1/2)NkT variable f=1. Or am I missing something?

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