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 ?

Explanation

The distance of closest approach varies inversely with kinetic energy of the alpha particle incident on the gold foil. Thus, on increasing the kinetic energy of the incident alpha particle, the distance of closest approach will decrease .