Question

The degrees of freedom of a triatomic gas is? (consider moderate temperature)

• A. $6$
• B. $4$
• C. $2$
• D. $8$

Answer 1

The correct option is A $6$

The general epression for degree of freedom is $DOF=3N-n$

here, DOF means degree of freedom, N is number of particle, and n is the number of holonomic constraints.

for a triatomic molecule, the number of particle is 3 and since the separation between three atoms are fixed so, the number of constraints is 3.

hence, $DOF=(3\times 3)-3$

$DOF=9-3$

$DOF=6$