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Answer by S. McGrew for Time it takes for and electron or atom to absorb a...
It could be argued that the amount of time required to emit a photon is essentially equal to the "coherence length" of the photon. Set up an interferometer, send identical photons through it one at a...
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When an atom or electron absorbs a photon, before the interaction you have an electron and a photon (possibly virtual). Afterwards, you have an excited electron (or atom). How much time does it take...
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