Rutherford's alpha-particle scattering experiment first showed that the atom has a .......

The size of the nucleus is of the order of

The ratio of specific charge of a proton and an $\alpha$-particle is

The radius of a nucleus with mass number $A$ is given by $1.25 \times 10^{-13} \times A^{1/3} \ cm$. If the radius of the atom is $1 \ \mathring{A}$ and the mass number is $64$,calculate the fraction of the volume occupied by the nucleus.

Which of the following is the correct statement for an electron?

Explain the discovery of protons.