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A Carnot engine uses first an ideal monoatomic gas $(γ = \frac{5}{3})$ and then an ideal diatomic gas $(γ = \frac{7}{5})$ as its working substance. The source and sink temperature are 411°C and 69°C respectively and the engine and the engine extracts 1000 J of heat from the source in each cycle, then :

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efficiencies of the engine in the two cases are in the ratio 21:25

area enclosed by the P-V diagram in only the first case is 500J

area enclosed by the P-V diagram in both cases is 500 J

heat rejected to the sink in the first case is 600 J while that in the second case is 713 J.

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detailed solution

Correct option is C

η=1-T2T1=WQ1 Here T1,T2 and Q1are same for both So W will be same. W=Q11-T2T1=10001-342684=500 J

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A Carnot engine uses first an ideal monoatomic gas γ=53 and then an ideal diatomic gas γ=75as its working substance. The source and sink temperature are 411°C and 69°C respectively and the engine and the engine extracts 1000 J of heat from the source in each cycle, then :

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