If a positron and electron annihilate, what is the frequency of light produced?
Is that frequency precise, depending upon the rest masses?
If we have a relative speed away from a light source, the light becomes redshifted.
How would this work out with a speed relative to the annihilation?
Would it depend upon the relative speeds of the particles before annihilation?
Would it depend upon the relative speed to the point of annihilation?
Since the annihilation would take some duration of time, no matter how small, there could be no actual pinpoint of annihilation, could there, maybe the halfway point?
Would it depend upon the relative speed to the light itself?
All three, or perhaps just the first two?