The energy of an electron in an orbit of an $H$-atom is:

The total energy of an electron in the $n^{th}$ stationary orbit of the hydrogen atom can be obtained by

Consider the following electronic energy level diagram of $H-$ atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labelled:

Total energy of an electron in an excited state of a hydrogen atom is $-3.4 \text{ eV}$. Find the kinetic and potential energy of the electron in this state.

In a hydrogen atom, the energy of an electron in the first and third orbits is $E_1$ and $E_3$ respectively. If $E_3 = x E_1$, then the value of $x$ will be:

The four lowest energy levels of an $H$-atom are shown in the figure. The number of possible emission lines would be