Question

The ratio of specific heats (C_P/C_V) in terms of degree of freedom (f) is given by: 

(A) (1 + f/3)

(B) (1 + 2/f)

(C) (1 + f/2)

(D) (1 + 1/f)

Answer 1

Correct option is (B) (1 + 2/f)

Molar heat capacity at constant volume C_V = fR/2

where f is degree of freedom.

Molar as C_P = R + C_V = R + fR/2 = (1 + f/2) R

So, C_P/C_V = 1 + 2/f