The spectral series which corresponds to the electronic transition from the level $n_2=5,6, \ldots$

Question

The spectral series which corresponds to the electronic transition from the level $n_2=5,6, \ldots$ to the level $n_1=4$ is

Professor PC Thomas Classes · Answer

(b) : Brackett series corresponds to the electronic transition from $n_2=5,6 \ldots$ to $n_1=4$ level.