mole of a perfect gas undergoes a cyclic process 
(see figure) consisting of the following processes -
Isothermal expansion at temperature 
so that the volume is doubled from 
to 
and
pressure changes from 
to 
.
Isobaric compression at pressure 
to initial volume 
.
Isochoric change leading to change of pressure from 
to 
.
Total work done in the complete cycle 
is –
Text Solution
Verified by ExpertsD
d JEE Main 2021
isotheraml process
isobaric process
isochoric process
also, 
work done by gas in the complete cycle 
is 
, as isochoric process
ln 
Now put the value of 
and 
in equation, we get 
ln 
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