2. The Brackett series of emission lines in the H atom spectrum are defined as those for which n2 = 4 and nz > 4. Using the Rydberg formula, find the (a) shortest and (b) longest possible wavelengths (in units of uum) for lines in this series. The Rydberg formula is 1 2 RH where Rw = 109,737 cm 1. (Hint: the shortest wavelength occurs as n +..] One min) n22