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

  • question_answer
    An ideal gas has temperature\[{{T}_{1}}\], at the initial state shown in the P- V diagram. The gas has a higher ternperature \[\,{{T}_{2}}\] at the final states a and b, which it can reach the paths shown. The change in entropy:

    A) greatest in a

    B) greatest in b

    C) same in a and b

    D) nothing can be said

    Correct Answer: B

    Solution :

    [b] \[{{Q}_{a}}=\Delta U+0=\Delta U\text{ and }{{Q}_{b}}=\Delta U+P\Delta V\] \[\text{As }{{Q}_{b}}>{{Q}_{a}},\] \[\therefore \] Change in entropy is greater in case [b].


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