AFMC AFMC Solved Paper-2008

  • question_answer
    A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically. The ratio of its final pressure to the initial pressure is (Given the ratio of the specific heats of the given gas to be 5/3)

    A) 32                                          

    B) 40/3

    C) 24/5                                      

    D) 8

    Correct Answer: A

    Solution :

    In an adiabatic process,\[p{{V}^{\gamma }}=\text{cosnstant}\] \[\Rightarrow \]               \[\frac{{{p}_{1}}}{{{p}_{2}}}={{\left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)}^{\gamma }}\] \[\Rightarrow \]        \[\frac{{{p}_{1}}}{{{p}_{2}}}={{\left( \frac{1}{8} \right)}^{5/3}}\] \[\Rightarrow \]      \[\frac{{{p}_{1}}}{{{p}_{2}}}={{\left( \frac{1}{{{2}^{3}}} \right)}^{5/3}}\]              \[=\frac{1}{32}\] \[\therefore \]       \[\frac{{{p}_{2}}}{{{p}_{2}}}=32\]


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