A poly atomic gas with n degrees of freedom has a mean kinetic energy per molecule given by (if $N$ is…

A poly atomic gas with n degrees of freedom has a mean kinetic energy per molecule given by (if $N$ is Avogadro's number)
  1. $\frac{n K T}{N}$
  2. $\frac{n K T}{2 N}$
  3. $\frac{n K T}{2}$
  4. $\frac{3 K T}{2}$

Solution

The mean kinetic energy of a polyatomic gas per molecule per degree of freedom is $ \lt \mathrm{K}$.E $\gt$ /dof/molecule $\begin{aligned} & =\frac{1}{2} \mathrm{KT} \\ & \therefore \quad \lt \mathrm{K} . \mathrm{E}\gt/ \text { molecule }=\left(\frac{1}{2} \mathrm{KT}\right) \mathrm{f}=\frac{\mathrm{nKT}}{2} \end{aligned}$

Asked in: AP EAMCET 2024 (21 May Shift 1)

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