(a) When a Proton-beam approaches the nucleus of a gold-atom, it is Scattered at large angles. Consider the kinetic energy of a proton beam as 7.7 MeV. If the proton's closest approach is Rp; Estimate the Size of the gold-nucleus The atomic number of Au is Z=79 and remember that the proton has a charge q=+e Besides the calculation's, you may briefly discuss your logical approach for finding Rp.