Physics

Problem

Consider two ideal diatomic gases A and B at some temperature

T

. Molecules of the gas A are rigid, and have a mass

m

. Molecules of the gas B have an additional vibrational mode, and have a mass

\frac{m}{4}

. The ratio of the specific heats (

C_v^A

and

C_v^B

) of gas A and B, respectively is: a. 7 : 9 b. 5 : 9 c. 3 : 5 d. 5 : 7