Question

A diatomic gas molecule has translational, rotational and vibrational degrees of freedom. The (C_p/C_ѵ) is 

(A) 1.29 

(B) 1.33 

C) 1.4 

(D) 1.67

Answer 1

The correct option (B) 1.33

Explanation:

Diatomic gas has translational, rotational & vibration degree of freedom 

Degree of freedom = 3(translatory) + 2 (rotatory) + 1(vibratory) = 6 

(C_p/C_V) = 1 + (2/f) 

∴ (C_p/C_V) = 1 + (2/6) = (4/3) = 1.33