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
A$0.25$
B$0.5$
C$0.75$
D$0.99$
Diffcult
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C$0.75$
c $\mathrm{T}_{1} \mathrm{V}_{1}^{\gamma-1}=\mathrm{T}_{2} \mathrm{V}_{2}^{\gamma-1}$
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