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

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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 \( \mathrm{V} \) to \( 32 \mathrm{~V} \), the efficiency of the engine is
(A) \( 0.99 \)
(B) \( 0.25 \)
(C) \( 0.5 \)
(D) \( 0.75 \)
\( \mathrm{P} \)
W
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