For a diatomic gas,let $\gamma_1 = \frac{C_p}{C_v}$ for rigid molecules and $\gamma_2 = \frac{C_p}{C_v}$ for diatomic molecules that also have a vibrational mode. Which of the following options is correct? ($C_p$ and $C_v$ are the specific heats of the gas at constant pressure and volume,respectively.)
- A$\gamma_2 > \gamma_1$
- B$\gamma_2 = \gamma_1$
- C$2 \gamma_2 = \gamma_1$
- D$\gamma_2 < \gamma_1$
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