Define the distance of closest approach. An `alpha`-particle of kinetic enegy `'K'` is bombarded on a thin gold foil. The distance of the closest approach is `'r'` . What will be the distance of closest approach for an `alpha`-particle of double the kinetic energy ?

(a) Define the distance of closest approach. A alpha -particle of kinetic energy K is bombarded on a thin gld foil. The distance of the closest approach is r_(a) . What will be the distance of closest approach for an alpha -particle of double the kinetic energy ? (b) Show that the radius of the orbit of an electron in hydrogen atoms varies as n^(2) , where n is the principal quantum number of the atom.

Define distance of closest approach?

What is distance of closest approach?