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wilco97531
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Is there a minimum time interval for two fundamental particles to interact, or is the interaction instantaneous? For example, if a photon excites an electron, is there a time period required for this interaction to take place? When a billiard ball hits another one there is obviously a time interval where momentum is being transferred from one ball to the other. Since fundamental particles seem to be uncompressible, is there are time interval for interaction or is it instantaneous?