$A$ hydrogen atom is excited from the ground state to a state with principal quantum number $n = 4$. The number of spectral lines emitted in the emission spectrum is:

Specify the quantum number for the limit wavelength of the spectral series of a hydrogen atom.

$A$ hydrogen atom absorbs radiation of wavelength $975 \, \mathring{A}$ and transitions from the ground state to an excited state. How many spectral lines are possible in the emission spectrum?

The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

The wavelength of light for the least energetic photons emitted in the Lyman series of the hydrogen spectrum is nearly. [Take $hc = 1240 \text{ eV-nm}$, change in energy of the levels $= 10.2 \text{ eV}$] (in $\text{ nm}$)

When an electron in a hydrogen atom jumps from the fourth Bohr orbit to the second Bohr orbit,we get the: