Spectral series of spectrum

The shortest wavelength spectral line in the brackett series of the spectrum of atomic hydrogen is the transition :

The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the

The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is

The ratio of te shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are: