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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Isobaric and Isochoric Processes

  • question_answer
    Unit mass of a liquid with volume \[{{V}_{1}}\] is completely changed into a gas of volume \[{{V}_{2}}\] at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is                                                                        [Roorkee 1999]

    A)            Zero                                         

    B)            \[P({{V}_{2}}-{{V}_{1}})\]

    C)            \[L-P({{V}_{2}}-{{V}_{1}})\]   

    D)            L

    Correct Answer: C

    Solution :

                       \[\Delta Q=\Delta V+P\Delta V\]Þ mL = DU + P(V2 ? V1) Þ DU = L ? P (V2 ? V1)             (\[\because \] m = 1)


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