Which series of hydrogen spectra lies in the visible region?

The Balmer series of lines in the hydrogen spectrum appear in the visible region of the electromagnetic spectrum. Calculate the wave number of the second line in the Balmer series.

The Balmer series of lines in the hydrogen spectrum appear in the visible region of the electron magnetic spectrum . Calculate the wave number of the second line in the Balmer series. ( Rydberg constant for hydrogen is 109677 cm^(-1)

Name the series of lines in the hydrogen spectrum belonging to the visible region.

Which one of the following series in the case of hydrogen spectrum is not of infrared region

Which isotope of hydrogen is radio active?