Question

It is possible for an electron and positron (an anti-electron) to be spontaneously created, so long...

It is possible for an electron and positron (an anti-electron) to be spontaneously
created, so long as they annihilate a short time later. Explain this in terms of
the Heisenberg uncertainty principle. Calculate the minimum energy necessary to
produce an electron-positron pair and estimate the time for which such pairs can
exist.

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