When an electron in an atom goes from a lower energy state to a higher energy state, the atom absorbs a photon of a specific frequency.
According to Neils Bohr, electrons in atoms occupy specific energy levels. The energy of an electron depends on the energy level where it is found.
When an electron moves from a lower to a higher energy level it absorbs a photon. Since the energy levels in an atom are quantized, the atom can only absorb a photon of a specific frequency.
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