Q.

A system consists of two types of gas molecules A and B having same number density 2×1025/m3. The diameter of A and B are 10 Å and 5 Å respectively. They suffer collision at room temperature. The ratio of average distance covered by the molecule A to that of B between two successive collisions is ____ ×10-2.


Ans.

(25)

∴   mean free path    λ=12πd2n

λ1λ2=d22n2d12n1=(510)2=0.25=25×10-2