Physics - Modern Physics Question with Solution | TestHub

The spectral series of the hydrogen atom are classified based on the region of the electromagnetic spectrum they fall into.

Lyman series corresponds to transitions to the ground state ($n_1=1$) and lies in the ultraviolet region.

Balmer series corresponds to transitions to the first excited state ($n_1=2$) and lies in the visible region.

Paschen, Brackett, and Pfund series correspond to transitions to higher states ($n_1=3,4,5$) and lie in the infrared region.

Thus, the Lyman series lies in the ultraviolet region.

Answer: Lyman