An $\alpha$-particle consists of:

Write the relation of the size of the nucleus to the atomic size.

Two nucleons are at a separation of $1 \times 10^{-15} \ m$. The net force between them is $F_1$ if both are neutrons,$F_2$ if both are protons,and $F_3$ if one is a proton and the other is a neutron. In such a case:

$A$ nucleus (of nuclear density $\rho$) disintegrates into two daughter nuclei with masses in the ratio $8 : 27$. The density of the smaller nucleus is

Who discovered the neutron?

At what distance does the minimum value of potential energy be obtained between the nucleons (in $fm$)?