An $\alpha$-particle consists of:

Two spherical nuclei have mass numbers $216$ and $64$ with their radii $R_1$ and $R_2$ respectively. The ratio,$\frac{R_1}{R_2}$ is equal to

The nucleus of an atom with an atomic mass of $24$ and atomic number $11$ consists of:

The radius of a nucleus of mass number $64$ is $4.8 \text{ fermi}$. Then the mass number of another nucleus having radius of $4 \text{ fermi}$ is $\frac{1000}{x}$,where $x$ is . . . . . . .

Which is the correct unit for measuring nuclear radii?

The order of the size of the nucleus and the Bohr radius of an atom,respectively,are: