Q9 of 27 Page 85

Figure 12.5 shows the P-V diagram of an ideal gas undergoing a change of state from A to B. Four different parts I, II, III and IV as shown in the figure may lead to the same change of state.


We know that internal energy of a system is equal to sum of

all kinetic and potential energies of the particles inside it.



Also, change in internal energy does not depend on path


it depends on initial and final states.


∴ internal energy is same for all the four paths.


Now,


work done is equal to the area under P-V curve


∴ work done is maximum for path 1.


option (b, c) is correct.

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