Experimental evidence for the existence of the atomic nucleus comes from

Rutherford's scattering experiment is related to the size of the

Write the formulas for calculating Coulombic forces and gravitational forces.

Cathode rays are made up of

The radius of a nucleus with mass number $A$ is given by $1.25 \times 10^{-13} \times A^{1/3} \ cm$. If the radius of the atom is $1 \ \mathring{A}$ and the mass number is $64$,calculate the fraction of the volume occupied by the nucleus.

The mass of the proton is $1840$ times that of the electron. If the potential difference applied is $V$,the kinetic energy of the proton is ............ $KeV$.