JEE MAIN - Physics (2020 - 6th September Evening Slot - No. 6)

In a dilute gas at pressure P and temperature T, the mean time between successive collisions of a molecule varies with T as :
$$\sqrt T $$
T
$${1 \over T}$$
$${1 \over {\sqrt T }}$$

Explanation

Time (t) = $${V \over {4\pi \sqrt 2 {r^2}vN}}$$ ....(1)

Here, v = most probable speed
= $$\sqrt {{{2RT} \over {\pi M}}} $$

$$ \Rightarrow $$ v $$ \propto $$ $$\sqrt T $$

$$ \therefore $$ From (1),

t $$ \propto $$ $${1 \over {\sqrt T }}$$

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