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Assuming that by “em” you mean “electromagnetic”(although that’s the only kind of photon), then yes, the upper case letter ##E## is...
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More precisely, our best current theories of physics do not contain any action at a distance, at least for one common meaning of that...
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Assuming that by “em” you mean “electromagnetic”(although that’s the only kind of photon), then yes, the upper case letter ##E## is...