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?
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
