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If the ratio of specific heat of a gas at constant pressure to that at constant volume is \( \gamma \), the change in internal energy of a mass of gas, when the volume changes from \( V \) to \( 2 \mathrm{~V} \) constant pressure \( p \), is [CBSE PMT 1998; MP PMT 2006]
\( \mathrm{P} \)
(a) \( R /(\gamma-1) \)
(b) \( p \mathrm{~V} \)
(c) \( p V /(\gamma-1) \)
(d) \( \gamma p \mathrm{pV} /(\gamma-1) \)
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