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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    If the ratio of specific heats of a gas at constant pressure to that at constant volume is \[\gamma ,\] the change in internal energy of a gas. When, the volume changes from V to 2V at constant pressure is

    A)  \[pV\]                                 

    B)  \[\frac{R}{\gamma -1}\]

    C)  \[\frac{pV}{\gamma -1}\]                           

    D)  \[\frac{\gamma \,pV}{\gamma -1}\]

    Correct Answer: C

    Solution :

                    The change in internal energy at constant pressure is \[dV=\frac{1}{\gamma -1}({{p}_{2}}{{V}_{2}}-{{p}_{1}}{{V}_{1}})\]       \[=\frac{1}{\gamma -1}(p\times 2V-p\times V)\]                 \[\]


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