Total degrees of freedom is given by 3N.

If the system has N number of restrictions in motion then the degrees of freedom decreases and it is equal to f = 3N-R where A is the number of particles.

A diatomic molecule has 2 rotational degrees of freedom.

A di atomic gas has 5 degree of freedom.

Degree of freedom is defined only at high Temperature.

Keeping the above important statements in mind, solve the following question, remember the condition is High Temperature.