The excitation of an atom by electromagnetic radiation and the emission of electromagnetic radiation from the excited atom is called what?

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Multiple Choice

The excitation of an atom by electromagnetic radiation and the emission of electromagnetic radiation from the excited atom is called what?

Explanation:
Absorbing a photon lifts an electron to a higher energy level, and when it relaxes back, it emits radiation. This combined sequence is an electronic (atomic) transition driven by electromagnetic radiation. Among the options, electron excitation fits best because it describes promoting the electron to a higher energy state. Ionization would remove the electron entirely, a nuclear transition involves the nucleus, and the Auger effect is a non-radiative relaxation that ejects another electron instead of emitting a photon.

Absorbing a photon lifts an electron to a higher energy level, and when it relaxes back, it emits radiation. This combined sequence is an electronic (atomic) transition driven by electromagnetic radiation. Among the options, electron excitation fits best because it describes promoting the electron to a higher energy state. Ionization would remove the electron entirely, a nuclear transition involves the nucleus, and the Auger effect is a non-radiative relaxation that ejects another electron instead of emitting a photon.

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