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Question

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



A

100 J

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B

 300 J

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C

500 J

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D

700 J

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Solution

The correct option is C

500 J


η=1T2T1=1(273+69)(273+411)=0.5

work done = η×Q=0.5×1000=500


Physics

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