Physics · PYQ NEET UG 2019(2)

The value of \( \gamma = \frac{C_p}{C_v} \) for hydrogen, helium and another ideal diatomic gas \( X \) (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to,

1. A
   \( \frac{7}{5}, \frac{5}{3}, \frac{7}{4} \)
2. B
   \( \frac{7}{5}, \frac{5}{3}, \frac{9}{7} \)
3. C
   \( \frac{5}{3}, \frac{7}{5}, \frac{9}{7} \)
4. D
   \( \frac{5}{7}, \frac{3}{5}, \frac{7}{5} \)