An `alpha`particle `(_2He^4)` is moving directly towards a stationary gold nucleus `(_(79)Au^(197))`.The `alpha`-particle and the gold nucleus may be considered to be solid spheres with the charge and mass concentrated at the centre of each sphere.When the two spheres are just toching,the sepaation of their centres is `9.6 xx 10^(-15) m`.
the `alpha` particle and the gold nucleus may be assumed to be an isolatedd system.Calculate for the `alpha` particle just in contact with the gold nucleus,
its electric potential energy.