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BVP Medical BVP Medical Solved Paper-2009

  • question_answer
    Two moles of an ideal gas expand spontaneously into vacuum. The work done is

    A)  2J                                          

    B)  4J

    C)  zero       

    D)  infinity

    Correct Answer: C

    Solution :

                    External pressure \[({{p}_{ext}})=0\] (for vacuum) In other words, the gas expands against a zero external pressure. Hence, no work is done, because there is no force which oppose expansion. \[W={{p}_{ext}}\Delta V=0\]                     


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