4 ms·
...in a vacuum
by juiceandjuice 16y ago
...in a vacuum
- iwr 16y agoStill, I don't see how the photons would be travelling at different velocities in the same medium.
- harshpotatoes 16y agoThey are all moving at the same speed, yes. They are moving in different directions, meaning they have different velocities, but the components of that vector will add up to c.
- photon_off 16y agoTechnically, photons always travel at c. Slow moving light is caused by the medium continually absorbing, delaying, then re-emitting the photon, or by other stuff which I won't pretend to understand [1]. Either way, rest assured that electromagnetic propagation always travels at c WRT any inertial frame. [1] http://en.wikipedia.org/wiki/Slow_light http://en.wikipedia.org/wiki/Slow_light