A nucleus at rest splits into two nuclear parts having same density and the radii in the ratio $1 : 2$ . Their velocities are in ratio ———
$2 : 1$
$4 : 1$
$6 : 1$
$8 : 1$
The mass number of a nucleus is
Write the definitions of isotopes, isobar and isotone.
$1 a.m.u.$ is equivalent to
The radius of germanium $(Ge)$ nuclide is measured to be twice the radius of ${}_4^9Be$ . The number of nucleons in $Ge$ are
The ratio of the density of oxygen nucleus $\left({ }_8^{16} O \right)$ and helium nucleus $\left({ }_2^4 He \right)$ is