Two protons exerts a nuclear force on each other, the distance between them is
Isotopes are atoms having
A nucleus has mass number $A_1$ and volume $V_1$.
Another nucleus has mass number $A_2$ and volume $V_2$. If relation between mass number is $A_2=4 A_1$, then $\frac{V_2}{V_1}=$_____.
The mass number of nucleus having radius equal to half of the radius of nucleus with mass number $192$ is:
The radius of a nucleus of mass number $64$ is $4.8$ fermi. Then the mass number of another nucleus having radius of $4$ fermi is $\frac{1000}{x}$, where $x$ is______.