The number of possible spectral lines in a hydrogen atom is:

The ratio of maximum to minimum wavelength in the Balmer series of a hydrogen atom is

The first line of the Balmer series has a wavelength of $6563 \mathring{A}$. What will be the wavelength of the first member of the Lyman series in $\mathring{A}$?

In hydrogen atoms,the transition from the state $n=6$ to $n=1$ results in ultraviolet radiation. Infrared radiation will be obtained in the transition:

The ratio of the largest to shortest wavelengths in the Lyman series of hydrogen spectra is

The ratio of momentum of the photons of the 1st and 2nd line of Balmer series of Hydrogen atoms is $\alpha/\beta$. The possible values of $\alpha$ and $\beta$ are:-