Q 11-12-020NEETJEE MainEasy
The pressure of a gas is doubled while its temperature is kept constant. Its mean free path
Answer: (B) is halved
Concept. $\lambda = \dfrac{kT}{\sqrt2\pi d^2p}$, so at constant $T$, $\lambda \propto \dfrac1p$.
Step 1. Double $p$. The molecules are packed twice as closely: $\lambda$ is halved.
Answer. Is halved (Option B).
Solution by Sreeraj P, M.Sc Physics