Light (a photon) is emitted by an atom when an electron jumps from a higher to a lower energy level. According to the Bohr theory of the atom, the energy levels that an electron can occupy in a atom are discreet. If the energy levels are discreet, their differences (photon energies, wavelengths, and colors) must also be discreet. Each spectral line represents a discreet energy difference.
The term "discreet" implies only certain definite values are possible with no other values in the intervals between the allowed discreet values.
What is the explanation for the discrete lines in atomic emission spectra?
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