Spectrum : The collection of waves of different frequency or wavelength in increasing or decreasing order of their wavelength or frequency is called as spectrum.
Depending on nature waves are of two type:
a) Continuous spectrum : A spectrum in which different regions are not separated by dark lines are called as continuous spectrum.
b) Line spectrum : The spectrum in which different regions are separated by dark fine lines are called as line spectrum.
Line spectrum are also of two type:
1) Atom emission spectrum : It is obtained from the radiation emitted from atom in its excited state (higher energy state of atom).
The radiation of excited atom are made to fall on prism so that a line emission spectrum of an atom is obtained.
2) Atom absorption spectrum :It is obtained from an atom in its ground state (lower most energy state).
When a white light is passed through an atom and it is taken up to prism after passing through an atom then it splits up and form a line absorption spectrum of an atom.
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