Question

A diatomic gas molecule has translational, rotational and vibrational degrees of freedom. The $C_{P}/C_{V}$ is

• A. 1.67
• B. 1.4
• C. 1.29
• D. 1.33

Answer 1

Answer: (D)

1.33

Answer 2

Degree of freedom $f = 3$

(Translatory)+2(rotatory) +1(vibratory) = 6

Ž $\frac{C_{P}}{C_{V}} = \gamma = 1 + \frac{2}{f} = 1 + \frac{2}{6} = \frac{4}{3} = 1.33$