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Absorption spectrum
and Emission spectrum
These two
phenomena are the evidences for the resonant columns in
atoms. When a cooled gas is placed in the path of a
continuous spectrum of light, dark absorption lines will
appear in the resulting spectrum. Similarly, if we
observe the gas in oblique angle, emission lines will be
visible against a dark background. When a photon falls
on an electron and the resonant frequency of the shell
(electron shell or transitory shell) in which the
electron presently exist matches with the frequency of
the photon, the photon will be efficiently absorbed by
the atom. In the resultant spectrum, the absorbed
photons will not be present. This is the reason for the
absorption line.
When a shell's electron absorbs a photon, the shell oscillates with
the frequency of the photon. This oscillation of the
shell causes its electron to create a photon in the same
frequency of the incident photon, i.e. emission line is
developed by reflected photons.
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