CMC Medical CMC-Medical VELLORE Solved Paper-2009

  • question_answer
    Work done per mol in an isothermal change is

    A)  \[RT{{\log }_{10}}\frac{{{V}_{2}}}{{{V}_{1}}}\]                   

    B)  \[RT{{\log }_{10}}\frac{{{V}_{1}}}{{{V}_{2}}}\]

    C)  \[RT{{\log }_{e}}\frac{{{V}_{2}}}{{{V}_{1}}}\]                     

    D)  \[RT{{\log }_{e}}\frac{{{V}_{1}}}{{{V}_{2}}}\]

    Correct Answer: C

    Solution :

                    For isothermal process \[pV=RT\Rightarrow p=\frac{RT}{V}\] \[\therefore \]  \[W=pdV=\int_{{{V}_{1}}}^{{{V}_{2}}}{\frac{RT}{V}}dV=RT{{\log }_{e}}\frac{{{V}_{2}}}{{{V}_{1}}}\]


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