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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    When an ideal monoatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is

    A) 2/5

    B) 3/5

    C) 3/7

    D) 5/7

    Correct Answer: B

    Solution :

    [b] By first law, \[\Delta Q=\Delta U+\Delta W\] \[=\frac{f}{2}nRT+P\int_{{}}^{{}}{dV=\frac{f}{2}}nRT+PV\] \[\Delta Q=\frac{f}{2}nRT+nRT=\frac{3}{2}nRT+nRT=\frac{5}{2}nRT\] \[\therefore \text{Fraction=}\frac{\left( 3/2 \right)nRT}{\left( 5/2 \right)nRT}=\frac{3}{5}\] 


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