Atomic Physics

According to Bohr's model of the hydrogen atom, the radius of the th orbit is given by: where is the radius of the first orbit (Bohr radius) and is the principal quantum number.
So, the radius of the th orbit increases with the square of .

The hydrogen spectrum consists of several series, among which the Lyman series corresponds to transitions that terminate at the energy level.
These transitions involve photons with high energy, hence they lie in the ultraviolet region of the electromagnetic spectrum.
In contrast: - Balmer series lies in the visible region.
- Paschen and Brackett series lie in the infrared region.