Question

A narrow beam of alpha particles with kinetic energy 1.0 MeV falls normally on a platinum foil 1.0 μm thick. The scattered particles are observed at an angle of 60° to the incident beam direction by means of a counter with a circular inlet area 1.0 cm² located at the distance 10 cm from the scattering section of the foil. What fraction of scattered alpha particles reaches the counter inlet?

Answer 1

From the formula (6.1 b) of the book

We have put q₁=2e,q₂=z e here. Also n = no. of Pt nuclei in the foil per unit area