First slide

Law of equipartition of energy

Question

The ratio of specific heats at constant pressure & volume of a gas is 9/7, then the number of degrees of freedom of the gas molecules is :

Easy

A

3
B

5
C

6
D

7

Solution

$C_{p} / C_{v} = 1 + \frac{2}{f} = \frac{9}{7} \Rightarrow f = 7$
where f is the degrees of freedom

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