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Why does red light travel faster than blue light?
One simple answer (and there are actual, deeper physics answers) is that the light interacts with the material, and those interactions are wavelength dependent. And, red light doesn't always travel faster than blue light - that is material dependent through those interactions mentioned above.
special relativity - Can One-Way Speed of Light be Instantaneous ...
As I've often read no information can be sent at more than the speed of light but here one-way taking the speed to infinite makes no difference. So are all of our physics theories based on the assumption and what would happen if light turns out to be moving at different speeds in different direction?
Does time stop at the speed of light? - Answers
According to the theory of relativity, time does not stop at the speed of light, but rather it slows down. This means that for an object traveling at the speed of light, time would appear to pass ...
Speed of light 3 x 10? - Answers
3 x 10 to the 8 power (meters per second)
Speed of light vs speed of electricity - Physics Stack Exchange
The speed of electricity is conceptually the speed of the electromagnetic signal in the wire, which is somewhat similar to the concept of the speed of light in a transparent medium. So it is normally lower, but not too much lower than the speed of light in the vacuum. The speed also depends on the cable construction.
Why does the speed of light change? - Physics Stack Exchange
The speed of light in a medium is given by 1 ϵμ√ 1 ϵ μ $\frac{1}{\sqrt{ϵ\mu }}$, where ϵ ϵ $ϵ$ and μ μ $\mu$ are the relative permittivity and permeability of the medium respectively (these in turn affect how large the electric & magnetic forces in the medium are). Since the permittivity & permeability of materials vary, it's not surprising that the speed of light varies as well.
Speed of Signals in a Wire vs Fiber Optic Cable
I would assume fiber optic cables transmit signals at the speed of light (this begs the question, are fiber optic cables vacuum sealed or is the light moving through air, but that wouldn't make much of a difference) but how does that compare with the speed of a signal moving through a conductor?
electromagnetism - Home experiments to derive the speed of light ...
Are there any experiments I can do to derive the speed of light with only common household tools?
On the Rømer experiments and the speed of light
Newton endorses the case of a finite speed of light. Presumably Newton had access to better data, allowing him to give a more accurate estimatation. Still, Newton didn't bother to try and arrive a value down to seconds. I assume that is because with the available data the 'seven or eight minutes' was the best estimate possible.
Speed of light when accelerating - Physics Stack Exchange
The most remarkable one for me is the universal speed of light. Einstein postulated that the speed of light in vacuum is the same for all inertial observers, regardless of the motion of the source. But what if we are accelerating and we are changing from one inertial frame to another, how will we observe the speed of light? Is it still the same?
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