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 lines in hydrogen atom is

Which of the following spectral series in hydrogen atom give spectral line of 4860 Å

Which of the following transition is associated with coloured spectral line

What is the number of spectral line in a hydrogen spectrum ?

Obtain the ratio of the shortest wavelength of spectral line in the Lyman series to the longest wavelength of spectral line in the Balmer series.

From the following transition for H-atom select the one which has the same wavelength as that of the fourth transition of Balmer series for He^(+) ion.