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55. 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.
You can't travel at the speed of light. So it's a meaningless question. The reason some people will say that time freezes at the speed of light is that it's possible to take two points on any path going through spacetime at less than the speed of light and calculate the amount of time that a particle would experience as it travels between those points along that path.
The speed of light in vacuum is constant and does not depend on characteristics of the wave (e.g. its frequency, polarization, etc). In other words, in vacuum blue and red colored light travel at the same speed c. The propagation of light in a medium involves complex interactions between the wave and the material through which it travels.
The state of an electron (or electrons) in the atoms isn't an eigenstate of the velocity (or speed) operator, so the speed isn't sharply determined. However, it's very interesting to make an order-of-magnitude estimate of the speed of electrons in the Hydrogen atom (and it's similar for other atoms). mv2 2 ∼ e2 4πϵ0r, mv ∼ ℏ r.
It can be derived from Maxwell's equations that the speed at which electromagnetic waves travel is: c = (ϵ0μ0) − 1 / 2. Since light is an electromagnetic wave, that means that the speed of light is equal to the speed of the electromagnetic waves. ϵ0 and μ0 are properties of the vacuum and are constants, so c will also be a constant.
If we exceed the speed of light, the order of cause and effect breaks down. This happens as we see our surroundings moving backward in time. Right? However, how do we know they move back in time once we move faster than light? If v> c v> c, then in the formula. t′ = t (1 −v2/c2)1/2 t ′ = t (1 − v 2 / c 2) 1 / 2.
Light is an electromagnetic radiation, the combined electromagnetic radiation of photon and electron produces a net wave which is slower Quantum super position means multiple paths thus larger distance but it does not mean it bends in different paths in classical sense, it just super imposes youtu.be/CiHN0ZWE5bk and youtu.be/YW8KuMtVpug is good ...
This speed is determined by the characteristics of the fish and the sea water. Likewise, the speed of light (electromagnetic waves), depends on the characteristics of light and the propagation "medium." Assuming a homogenous universe, the speed of light would have a constant value throughout the universe (independent of any observer).
The speed of light is 299 792 458 m/s because people used to define one meter as 1/40,000,000 of the Earth's meridian - so that the circumference of the Earth was 40,000 kilometers. Also, they used to define one second as 1/86,400 of a solar day so that the day may be divided to 24 hours each containing 60 minutes per 60 seconds.
7. Yes, it is often assumed that Rømer measured the speed of light in one direction. It may seems trange, but Rømer velocity is also the velocity obtained under the tacit assumption of the equality of the speeds of light in opposite directions. The fact of the matter is that Rømer and Cassini were speculating about the movement of Jupiter ...