Chapter 19, Problem 19.39E

Interpretation Introduction

Interpretation:

The mean free path between hydrogen atoms in interstellar space if $d=1.10\stackrel{\circ }{\text{A}}$ for hydrogen is to be calculated by using the conditions of exercise 19.12.

Concept introduction:

The mean free path is calculated by the formula,

$\lambda =\frac{V}{\sqrt{2}\pi N{d}^2}$

Where,

• $V$ is the volume of the gas.

• $N$ is the number of atoms.

• $d$ is the interstellar space.