Calculate the longest wavelength of the Balmer series spectrum

Calculate the longest wavelength of the Paschen series spectrum. (Rydberg constant = 1.97 xx 10^7 xx 10^7 m^-1)

Calculate the shortest and longest wavelength of Balmer series. (R = 1.1 xx 10^7 m^-1) . In which region of em spectrum do these two wave lengths lie?

Calculate the ratio of the longest to the shorest wavelength of Balmer series of hydrogen spectra.

If the series limit of wavelength of the Lyman series for the hydrogen atom is 912 overset@A , then the series limit of wavelength for the Balmer series of the hydrogen atom is: