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  • A gas is expanded from initial volume of Vi = 1 litre to Vf = 2 litre. The process is isothermal but irreversible then work done (in Joule) is <div class='qna-op

A gas is expanded from initial volume of Vi = 1 litre to Vf = 2 litre. The process is isothermal but irreversible then work done (in Joule) is 

Option: 1

100


Option: 2

50


Option: 3

-100


Option: 4

-50


Answers (1)

best_answer

As we learnt

Work done for Irreversible Isothermal Expansion of an ideal gas -

W= -P_{ext}\left ( V_{f} -V_{i}\right )

P_{ext} may be equal to P_{f} or may not be equal to P_{f}, but work done is always calculated by P_{ext}

 

W= -P_{ext}\left ( V_{f} -V_{i}\right )

       = -10^5P_a\times(2\times10^{-3}-1\times10^{-3})m^3= -100J

Posted by

jitender.kumar

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