CAPE Physics Unit 2 · 2003 · Paper 1 · Question 8(b)(i)

A beam of X-rays, of intensity I_0, is incident on a slab of material of thickness x_1 and linear absorption coefficient mu_1, as shown in Figure 8 a.

Write an expression for the emerging intensity, I, in terms of I_0, mu_1 and x_1.

This question uses a figure or table from the paper — you'll see it when you practise.