Question

The mean free path λ of molecules is given by

(A) $\sqrt{\frac{2}{\pi n{d}^2}}$

(B) $\frac{1}{\pi n{d}^2}$

(C) $\frac{1}{\sqrt{2}\pi n{d}^2}$

(D) $\frac{1}{\sqrt{2\pi nd}}$

where n is the number of molecules per unit volume and d is the diameter of the molecules.

Answer 1

C) $\frac{1}{\sqrt{2}\pi n{d}^2}$