The spectrum of H-atom studied by Lyman, Balmer, Paschen, Bracken and Pfund can now be explained on the basis of Bohr’s Model. It is now clear that when an electron jumps from a higher energy state to a lower energy state, the radiation is emitted in form of photons. The radiation emitted in such a transition corresponds to the spectral line in the atomic spectra of H-atom.

CBSE Class 12 Physics Notes: Dual Nature of Radiation and Matter - Energy Levels of Hydrogen Atom

Lyman Series

When an electron jumps from any of the higher states to the ground state or 1st state (n = 1), the series of spectral  lines emitted lies in ultra-violet region and are called as Lyman Series. The wavelength (or wave number) of any line of the series can be given by using the relation:

CBSE Class 12 Physics Notes: Dual Nature of Radiation and Matter - Energy Levels of Hydrogen Atom

Paschen Series

When an electron jumps from any of the higher states to the state with n = 3 (IIIrd state), the series of spectral lines emitted lies in near infra-red region and are called as Paschen Series. The wave number of any spectral line can be given by using the relation:

CBSE Class 12 Physics Notes: Dual Nature of Radiation and Matter - Energy Levels of Hydrogen Atom

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