In the line spectrum of atomic hydrogen there is also a group of lines known as the Brackett series.

In the line spectrum of atomic hydrogen there is also a group of lines known as the Brackett series. These lines are produced when electron, excited to high energy levels, make transitions to the n = 4 level. Determine (a) the longest wavelength in thes series, and (b) the wavelength that coreesponds to the transition from ni = 6 to nf = 4. (c) Identify the region of the electromagnetic specturm in which these lines are found