The mass number of nucleus having radius equal to half of the radius of nucleus with mass number $192$ is:

Atomic number of a nucleus is $Z$ and atomic mass is $M.$ The number of neutron is

From the statements given below:$(A)$ The angular momentum of an electron in $n^{\text {th }}$ orbit is an integral multiple of $h$.$(B)$ Nuclear forces do not obey inverse square law.$(C)$ Nuclear forces are spin dependent.$(D)$ Nuclear forces are central and charge independent.$(E)$ Stability of nucleus is inversely proportional to the value of packing fraction.

Choose the correct answer from the options given below :

The radius of germanium $(Ge)$ nuclide is measured to be twice the radius of ${}_4^9Be$ . The number of nucleons in $Ge$ are

A nucleus disintegrates into two nuclear parts, in such a way that ratio of their nuclear sizes is $1: 2^{1 / 3}$.Their respective speed have a ratio of $n: 1$. The value of $n$ is $.....$.

$1 a.m.u.$  is equivalent to