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A diatomic ideal gas is used in a Carnot engine as the working substance.

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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 32V, the efficiency of the engine is

(a) 0.25 

(b) 0.5

(c) 0.75 

(d) 0.99

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(c) : For an adiabatic process

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