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11. A Carnot’s engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411°C  and 69°C   respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the PV diagram is 

(a)  100 J                                  (b)  300 J

(c)   500 J                                  (d)  700 J

Answer-c

(14)

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