One source of light is, IIRC my high school physics, when an excited electron jumps back to its normal position. This jump generates a photon. How can an event like that shoot of a particle at the speed of light? Why isn't it this photon moving much slower? Other particles can move at almost the speed of light but typically is much slower..
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$\begingroup$ Possible duplicate of How can a photon have no mass and still travel at the speed of light? $\endgroup$ – BioPhysicist Apr 13 '19 at 10:52
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1$\begingroup$ There is a reason we can talk about the speed of light, but you never hear anyone say the speed of electrons or the speed of apples etc. $\endgroup$ – BioPhysicist Apr 13 '19 at 10:54
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1$\begingroup$ Possible duplicate of Does a photon instantaneously gain $c$ speed when emitted from an electron? $\endgroup$ – John Rennie Apr 13 '19 at 11:27
