The ratio of wavelength of photon corresponding to the `alpha`-line of Lyman series in H-atom and `beta`- line of Balmer series in `He^(+)` is :

The ratio of wave length of photon corresponding corresponding to the alpha -line of Lyman series in H-like and beta-line of Balmer series in He^(+) is

the ratio of the wavelengths of alpha line of lyman series in H atom and beta line of balmer series in he+ is

The ratio of wavelength of 1st line of Balmer series and 2nd line of Lyman series is :

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is :-

The ratio of wavelength of the lest line of Balmer series and the last line Lyman series is:

The ratio of wavelength of the lest line of Balmer series and the last line Lyman series is:

The ratio of wavelength of the last line of Balmer series and the last line of Lyman series is ....