The \(\gamma \left( = \frac{C_p}{C_v} \right)\) values of a rigid diatomic gas molecule and a monoatomic gas molecule are in the ratio
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Rigid diatomic means vibration degrees of freedom are not counted. Always remember \(\gamma_{mono} = 1.67\) and \(\gamma_{di} = 1.4\). The ratio \(1.4 / 1.67\) is clearly less than 1, helping you eliminate options A, C, D, and E.