List of top Physics Questions on Atomic Structure asked in CBSE CLASS XII

Write the mathematical forms of three postulates of Bohr’s theory of the hydrogen atom. Using them prove that, for an electron revolving in the \( n \)-th orbit,
(a) the radius of the orbit is proportional to \( n^2 \), and
(b) the total energy of the atom is proportional to \( \frac{1}{n^2} \).

Assertion (A): In Rutherford’s alpha particle scattering experiment, the presence of only few alpha particles at angle of scattering \( \pi \) led him to the discovery of the nucleus.
Reason (R): The size of the nucleus is approximately \( 10^{-5} \) times the size of an atom and therefore only few alpha particles are rebounded.

The energy of an electron in an orbit of Bohr hydrogen atom is \( -3.4 \, \text{eV} \). Find its angular momentum.