Question

The intensity of the radiation scattered coherently by ‘point source’ electrons has been treated theoretically and is given by which of the following equations?

(a) Einstein equation

(b) Maxwell equation

(c) Stockbarger equation

(d) Thomson equation

This question was addressed to me in homework.

Query is from Intensities topic in chapter X-Ray Diffraction of Solid State Chemistry

Answer 1

The correct answer is (d) Thomson equation

To explain: Thomson equation is given by:-

Ip α ½( 1+ cos^22Θ)

Here, Ip is the scattered intensity at any point P, and 2Θ is the angle between the directions of the incident beam and the diffracted beam that passes through P, from this equation it can be seen that the scattered beams are most intense when parallel or antiparallel to the incident beam and the weakest when at 90˚ to the incident beam.