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

As the distance of closest approach is inversely proportional to the kinetic energy of the `alpha`-particle. Therefore, distance of closest approach will become half.