Question

The degree of freedom of a three atomic molecule can not be 5. true=1, false=0

Answer 1

A polyatomic linear molecule having N molecules has :

(i) $3$ translation degrees of freedom .

(ii) $2$ rotational degrees of freedom .

(i) $3N-5$ vibrational degrees of freedom .

Hence total degrees of freedom ,

$f=3+2+3N-5=3N$

But for a triatomic linear molecule , if there is no vibrational motion then

$f=5$ , the degrees of freedom for a triatomic molecule can be 5 .

Given statement is false=0.