The energy of an electron in the $n^{th}$ orbit of a hydrogen atom is given by:

The ratio of the maximum wavelengths of the Lyman and Balmer series is ....

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is

When a hydrogen atom in an excited state undergoes electronic transitions to the ground state,$5$ spectral lines are observed in the ultraviolet region. How many spectral lines will be observed in the infrared region due to transitions from the same excited state?

For a hydrogen atom with $n = 1$,the radius of the Bohr orbit is approximately $0.530 \, \mathring{A}$. What will be the radius for the first excited state $(n = 2)$ in $\mathring{A}$?

In the hydrogen spectrum,if an electron transitions from the $6^{th}$ orbit to the $3^{rd}$ orbit,what is the total number of spectral lines produced?