Question

In a head on colliosion between an alpha particle and a gold mucleus

Answer 1

An alpha particle with a kinetic energy of 11.0 MeVmakes a head-on collision with a gold nucleus at rest. ... (Assume that the gold nucleus remains stationary and that it may be treated as a point charge. The atomic number of gold is 79, and an alpha particle is a helium nucleus consisting of two protons and two neutrons.)