Chapter 21, Problem 21.24E

Interpretation Introduction

Interpretation:

The reason as to why there would not be second-order diffraction if the first-order diffractions occur at angles greater than $30°$ is to be explained.

Concept introduction:

A unit cell of the crystal is the three-dimensional arrangement of the atoms present in the crystal. The unit cell is the smallest and simplest unit of the crystal which on repetition forms an entire crystal. The parameters of a crystal can be obtained experimentally by X-ray diffraction technique.