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Then I would say no by that definition. There's probably a fair bit of clear blue water between that dictionary definition and what you...
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Yes. That is the only kind of photon that exists.
They can (e.g. a diverging lens). They don’t always (e.g. a converging lens).
Radio...
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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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For a single photon E can be any value. But m will always be 0