Quote:
Originally Posted by mithrandir
Yes and yes.
If they weren't traveling at c they would have no mass/energy and not even exist.
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Yes.
When a photon is created, it has finite energy (E = h
v) and no mass, so the energy must move at c.
Think about it from the photon's POV: it does not experience time (because it moves at c in our reference frame) so only exists as a vector of energy from the start to where it is absorbed for an "instant". There is no option for it to exist at rest in our reference frame.
Al.