AFMC AFMC Solved Paper-2009

  • question_answer
    A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?

    A) \[\frac{3}{5}\]                                   

    B) \[\frac{3}{7}\]

    C) \[\frac{5}{7}\]                                   

    D) \[\frac{5}{9}\]

    Correct Answer: C

    Solution :

    Fraction of supplied energy which increases the internal energy is given by \[f=\frac{\Delta U}{(\Delta {{Q}_{p}})}=\frac{{{(\Delta Q)}_{v}}}{{{(\Delta {{Q}_{p}})}_{p}}}\] \[=\frac{\mu {{C}_{V}}\Delta \Tau }{\mu {{C}_{p}}\Delta \Tau }=\frac{1}{\gamma }\] For diatomic gas \[\gamma =\frac{7}{5}\]\[\Rightarrow \]   \[f=\frac{5}{7}\]


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