How is the size of nucleus experimentally determined ? Write the relation between the radius and mass number of the nucleus. Show that the density of nucleus is independent of its mass number.

Explanation

Nucleus: It was first discovered in `1911` by Lord Rutherford and his associates by experiments on sacttering of `alpha`-paticles by atoms. He found that the scattering result could be explained, if atoms consists of a small central massive and positive core surrounded by orbiting electron. The experimenbt results indicated that the size of the nucleus is of the order of `10^(-14)` meters and is thus, `10,000` times smaller than the size of atom. It there are `N` neutrons in the nucleus, then the number of protons and neutrons is given by
`A=Z+N`
`A rarr "Mass number"`
`N rarr "neutrons"`
`Z rarr "Protons"`
Actually mass nunber is integer closest to the nuclear mass.