A diatomic ideal gas is used in a carnot engine as the working substance. If during the adiabati...

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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) \( 25 \% \)
(b) \( 5 \% \)
(c) \( 75 \% \)
(d) \( 99 \% \)
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