If the ratio \( C_{\mathrm{p}} / C_{\mathrm{v}}=\gamma \), the change in internal energy of the ...

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If the ratio \( C_{\mathrm{p}} / C_{\mathrm{v}}=\gamma \), the change in internal energy of the mass of a gas, when volume changes from \( V \) to \( 2 V \) at constant pressure \( P \), is
(a) \( \frac{R}{\gamma-1} \)
(b) \( P V \)
(c) \( \frac{P V}{\gamma-1} \)
(d) \( \frac{\gamma P V}{\gamma-1} \)
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