All Problems

Dispersion and Absorption of Light

Problem 5.222

Find the thickness of aluminium layer which reduces by half the intensity of a narrow monochromatic X-ray beam if the corresponding mass absorption coefficient is μ/ρ=0.32 cm2/g\mu / \rho=0.32 \mathrm{~cm}^{2} / \mathrm{g}.

Reveal Answer
d=(ln2)/μ=8 mmd=(\ln 2) / \mu=8 \mathrm{~mm}