Q. The mean free path of molecules of a gas, (radius r) is inversely proportional to :
A) $r^3$
B) $r^2$
C) r
D) $\sqrt{r}$
Explanation
[Solution] $\lambda = \frac{1}{\sqrt{2}\pi d^2 n}$, so λ ∝ $\frac{1}{r^2}$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.