The specific heats, `C_(P)` and `C_(V)` of a gas of diatomic molecules, A are given (in units of `Jmol^(-1) K^(-1)`) by 29 and 22 , respectively. Another gas of diatomic molecules , B has the corresponding values 30 and 21. if they are treated as ideal gases, then :

Options

A. A is rigid but B has a vibrational mode.
B. A has vibrational mode but B has none.
C. A has one vibrational mode and B has two.
D. Both A and B have a vibrational mode each.

Answer

A