Heat and Thermodynamics 5 Question 20
21. An ideal gas expands isothermally from a volume to and then compressed to original volume adiabatically. Initial pressure is and final pressure is . The total work done is . Then,
(2004, 2M)
(a)
(b)
(c)
(d)
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Solution:
- Slope of adiabatic process at a given state
is more than the slope of isothermal process. The corresponding graph for the two processes is as shown in figure.
In the graph,
and
Hence,
From the graph itself, it is clear that
NOTE At point