Recall that starting from n = 1, the distance between each energy level gets smaller as shown below:
Emission is a transition process from a higher energy level to a lower energy level.
Recall that the energy of a photon is given by:
We can see that energy and frequency are directly proportional. The energy in a transition also depends on the distance between the energy levels.
The energies, E, for the first few states of an unknown element are shown here in arbitrary units.
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