what are emission lines
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Emission Line
An emission line will appear in a spectrum if the source emits specific wavelengths of radiation. This emission occurs when an atom, element or moleculein an excited state returns to a configuration of lower energy. Since every atom, element and molecule has a unique set of energy levels, the emitted photon(‘packet’ of radiation) has a discrete wavelength, and an energy equal to the difference between the initial and final energy levels
The spectrum of a material in an excited state shows emission lines at discrete frequencies.
Photons with specific energies will be emitted by an atom, ion or molecule in an excited state. The energy is equal to the difference between the higher and lower energy levels. In this example, three different photon energies are emitted as electrons move from excited states (n=2,3 and 4) to the ground state (n=1).
Emission lines are usually seen as bright lines, or lines of increased intensity, on a continuous spectrum.
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lines which are formed when a proton sized particle is hit by light of particular frequency on a particular back ground
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