The change in internal energy of a mass of gas,when the volume changes from $V$ to $2V$ at constant pressure $P$,is (where $\gamma$ is the ratio of $C_p$ to $C_v$):

  • A
    $\frac{PV}{\gamma-1}$
  • B
    $\frac{P}{\gamma-1}$
  • C
    $PV$
  • D
    $\frac{\gamma PV}{\gamma-1}$

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