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What happens to the energy of an atom or molecule when a photon is absorbed or emitted by it?
Increased or decreased
By how much does the energy of an atom or molecule increase or decrease when a photon is absorbed or emitted by it?
Same energy as the photon
When does the energy of an atom or molecule increase or decrease?
When a photon is absorbed or emitted by it
What happens to a sample in spectroscopy?
Exposed to a source of electromagnetic radiation