A Carnot engine uses diatomic gas as a working substance. During the adiabatic expansion part of the cycle, if the volume of the gas becomes 32 times its initial volume, then the efficiency of the engine is
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Memorize specific heat ratios (\(\gamma\)) for common gases: Monoatomic \(= \frac{5}{3}\), Diatomic \(= \frac{7}{5}\), Polyatomic \(= \frac{4}{3}\). Standard powers of 2 (like \(32 = 2^5\)) frequently appear in such thermodynamic problems to simplify fractional exponents without a calculator.