# NEET Physics Atoms Questions Solved

In a Geiger - Marsden experiment, calculate the distance of closest approach to the nucleus of Z = 80, when an $\mathrm{\alpha }$ particle of 8 MeV energy impinges on it before it comes momentarily to rest and reverses its direction.

How will the distance of closest approach be affected when the kinetic energy of the $\mathrm{\alpha }$ is doubled?