Suppose that two nuclear particles collide with each another in a head-on elastic collision. The mass of the rst nuclear particle is m1 and the mass of the second nuclear particle is m2. If m2 is...

Suppose that two nuclear particles collide with each another in a head-on elastic collision. The mass of the rst nuclear particle is m1 and the mass of the second nuclear particle is m2. If m2 is initially at rest, show that a necessary and suf- cient condition for the rst particle to backscatter from the second is m1 <>