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Q.

A Carnot engine used first an ideal monoatomic gas then an ideal diatomic gas as working substance. If the source and sink temperature are 411oC and 69oC respectively and the engine extracts I000 J of heat in each cycle, then area enclosed by the PV diagram is

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a

100 J

b

300 J

c

500 J

d

700 J

answer is A.

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Detailed Solution

η = 1-T2T1 = 1-(273+69)(273+411) = 0.5⇒Work done = η×Q = 0.5×1000 = 500 J
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