Physics · PYQ NEET UG 2019(2)
हिन्दीThe 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,
Correct answer · Option 2
\( \frac{7}{5}, \frac{5}{3}, \frac{9}{7} \)
Explanation
For diatomic gas (hydrogen) \( \gamma = 7/5 \). For monoatomic gas (helium) \( \gamma = 5/3 \). For diatomic gas with vibrational mode, degrees of freedom \( f = 7 \), so \( \gamma = 1 + 2/7 = 9/7 \).