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Q.

A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increases from V to 32 V, the efficiency of the engine is :

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a

0.25

b

0.5

c

0.75

d

0.99

answer is C.

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Detailed Solution

T1V1γ−1=T2V2γ−1⇒T2T1=14 So, η=1−T2T1=0.75
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