Question

Explain Brackett series of spectral lines for the hydrogen atom.

Answer 1

1. The spectral lines of this series corresponds to the transition of an electron from a higher energy state to the 4th orbit.
   For this series, p = 4 and n = 5, 6, 7, ....
2. The wave numbers and the wavelengths of the spectral lines constituting the Bracket series are given by
   `barv = 1/lambda = R(1/4^2 - 1/n^2)`
   These series lie in the near infrared region of the spectrum.