Which of the following transition in `He^(+)` ion will give rise to a spectral line which has the same wavelength as some spectral line in the hydrogen atom ?

Assume that helium obeys the Bohr theory exactly. Which of the following transition in helium will not give rise to a spectral line which has the same wavelength as some spectral line in the hydrogen spectrum?

Number of spectral line in hydrogen atom is .

Number of spectral lines in hydrogen atom is

Number of spectral lines in hydrogen atom is

The number of spectral lines in hydrogen atom are

Explain the different series of spectral lines in hydrogen atom.

Explain the origin of spectral lines in the case of hydrogen atom