Recent content by gonchenshi

The de Broglie relations, mostly.

This has nothing to do with my problem. I have no difficulty with velocity addition, I do have difficulty understanding how relativity can allow waves to travel through vacuum at speeds faster (or just different from) c.

But that's like saying that since electromagnetic waves are waves of light (photons), they don't travel through vacum, either.

But the reason a wave travels is because the previous state of the wave results in the next state of the wave (eg. light travels because the changing electromagnetic field changes the electromagnetic field around it). So for a wave, state A did make happen state B, er... right?

Can you explain the attached part in more detail, please? (Maths is ok)

Well, what I am thinking is that this may be a problem for the principle of relativity, so is there an explanation that doesn't use it?

According to relativity, any wave that can travel through vacuum can do so only at c, because since vacuum looks the same for every observer, so should the mechanism allowing the waves to travel (since that takes place in the vacum) and therefore the speed at which the wave travels (I think)...

A point charge moving at constant velocity causes unconstant changes in the electric field. Won't that generate an electromagnetic wave?