First slide

Law of equipartition of energy

Question

A diatomic gas is at temperature T. The mean rotational kinetic energy of the gas molecules is

Easy

A

$\frac{5}{2} K T$
B

$\frac{3}{2} K T$
C

$K T$
D

$\frac{K T}{2}$

Solution

diatomic gas has two rotational degrees of freedom and according to equipartition law of energy every degrees of freedom has an energy associated of $\frac{1}{2} K T$

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