An atom in its ground state is excited when it absorbs a single photon of light. The atom then relaxes back to the ground state by emitting two photons, the first, a red photon at 700 700 nm, and the second, an infrared photon at 2100 nm. What is the wavelength of the absorbed photon?
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An atom in its ground state is excited when it absorbs a single photon of light. The atom then relax...
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