If we have an atom that is in an excited state and so is going to emit a photon, we cannot say when it will emit the photon. It has a certain amplitude to emit the photon at any time, and we can predict only a probability for emission; we cannot predict the future exactly.

Richard P. Feynman

Richard P. Feynman

Any Atom Cannot Certain Exactly Excited Future Going Only Predict Probability Say State Time We Cannot Will

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