1. The problem statement, all variables and given/known data If the radius of the gold nucleus is 6.47 fm, and the radius of the α particle is 2.36 fm, then what is the minimum required kinetic energy for the α particle if we want the two nuclear surfaces to touch in a head-on collision? 2. Relevant equations Ue=(kq1q2)/r 3. The attempt at a solution so using Ue=KE q1=2 q2=79 then it should be straightforward plug and chug, however the KE this yields is very high, around 3E45 eV this cannot be right, what am I doing wrong?