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I dunno, I got it off Wikipedia. Change it if you think its wrong.
I still don't understand what you are referring to. I never said anything about particles (mass). I'm talking about magnetism and light.AlphaNumeric said:Neither of those types of waves can both travel slower than light and at light. The speed of a disturbance through a medium depends on the properties of the medium. Sound is a disturbance in air, and goes at about 330m/s. In steel it's more like 2km/s! There isn't a medium in which it could go as fast as light through.
Yes, as a disturbance passes through more and more rigid media (or you're accelerating a particle) time will pass slower for it, and you'd need to bring in relativistic equations. It will not actually reach the speed of light though. Particles can't do it, they have mass (if they didn't, they'd only move at the speed of light) and disturbances can't do it because the medium they are in has mass.