The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. The hydrogen atoms of the molecule dissociate as soon as an electric discharge is passed through a gaseous hydrogen molecule. It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms.

The H-spectrum is the spectrum of hydrogen atoms and it shows the presence of quantized energy levels. This is explained by the Bohr model of the hydrogen atom, which postulates that the electron in the hydrogen atom can only occupy certain discrete energy levels.

Bohr's model states that the electron in a hydrogen atom can only occupy certain orbits, or energy levels, around the nucleus. These energy levels are quantized, which means that they are discrete and cannot take on any arbitrary value. When an electron moves from a higher energy level to a lower energy level, it emits a photon of a specific wavelength, which can be detected as a spectral line in the H-spectrum.

The H-spectrum consists of a series of spectral lines, which correspond to the different transitions that the electron can make between the energy levels in the hydrogen atom. These spectral lines are characterized by their wavelengths, which are determined by the energy difference between the two energy levels involved in the transition.

The quantized energy levels in the hydrogen atom are determined by the electrostatic attraction between the negatively charged electron and the positively charged nucleus. The energy levels are given by the equation E = -13.6/n^2, where n is an integer that represents the energy level. As n increases, the energy of the electron increases and the distance between the electron and the nucleus increases.

In conclusion, the H-spectrum shows the presence of quantized energy levels in the hydrogen atom, which are responsible for the discrete spectral lines observed in the spectrum. These energy levels are determined by the electrostatic attraction between the electron and the nucleus and are given by the equation E = -13.6/n^2.