When light interacts with atoms or molecules, what happen to the atom or molecule?
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Light interacts with electrons in a photoelectric panel and with photorhodopsin molecules in the retina of the eye. Each electron is excited by its interaction with one photon, and that the photon is an indivisible quantity of light.
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When atoms or molecules absorb light the electrons absorb the energy and move into higher energy orbits farther away from the nucleus. When the excited electron returns to a lower energy orbit it releases a photon of electromagnetic radiation.
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