The plot that depicts the behavior of the mean free time
Question:

The plot that depicts the behavior of the mean free time $\tau$ (time between two successive collisions) for the molecules of an ideal gas, as a function of temperature $(T)$, qualitatively, is: (Graphs are schematic and not drawn to scale)


Correct Option: , 3

Solution:

(3) Relaxation time $(\tau) \propto \frac{\text { mean free path }}{\text { speed }} \Rightarrow \tau \propto \frac{1}{\mathrm{~V}}$

and, $v \propto \sqrt{T}$

$\therefore \tau \propto \frac{1}{\sqrt{T}}$

Hence graph between $\tau \mathrm{v} / \mathrm{s} \frac{1}{\sqrt{T}}$ is a straight line

which is correctly depicted by graph shown in option (3).

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