[ScientificBoysClub]

Does light travel infinite distance ? How light gets energy to travel with c?

Well.... How light can travel with constant velocity 299 792 458 m / s  ....... what is making it to travel with that velocity ??

And Does any particle travels faster then velocity of light ?

[Vern]

Light travels at c because it naturally behaves in accord with Maxwell's equations; these operate with the electric permittivity and magnetic permeability of space and produce a wave that must move through space at the speed of light.


Nothing moves faster than light. There are cases where entangled photons and maybe particles seem to sense each other's state faster than light; we don't yet know just exactly what is happening in this case.

[ScientificBoysClub]

Light travels at c because it naturally behaves in accord with Maxwell's equations; these operate with the electric permittivity and magnetic permeability of space and produce a wave that must move through space at the speed of light.


Nothing moves faster than light. There are cases where entangled photons and maybe particles seem to sense each other's state faster than light; we don't yet know just exactly what is happening in this case.

is it possible to change  electric permittivity and magnetic permeability of space and time if we can make space and time unstable ...if its possible can we increase the light speed ?

[Vern]

You can't change it in space; there are substances in which it is different than in a vacuum; this can cause light to move more slowly through certain media. There's no way that I know about that you can do better than a perfect vacuum. I think we're stuck with the speed of c.

[lightarrow]

Someone conjectures that inside two very near metal plates, when Casimir effect takes place, light could travel faster than c because the energy density (and/o charged virtual particles density) there is lower than in the void, so electric permittivity would be less than ε₀, or there is less photon scattering with virtual particles. Just speculations however, I don't know anything than this.
http://arxiv.org/ftp/physics/papers/9911/9911062.pdf
http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html
http://www.daviddarling.info/encyclopedia/C/Casimir.html
http://en.wikipedia.org/wiki/Faster-than-light

[Seth????????]

You can outrun light simply by changing its state or perhaps if you apply distance to the formula but light is a photon ...for instance a led with new batteries is brighter than a light that Illumins a swimming pool. ..the light in the pool is tired because it's state of having to travel through water, even if the bulb is led it will not appear as bright under water. This happens because the liquid slows the photon down making the speed of light. ..actually change depending on the conditions where it can be observed..seth

[Colin2B]

You can outrun light simply by changing its state or perhaps if you apply distance to the formula

Could you explain what you mean as that comment does not appear to make sense.

but light is a photon ...for instance a led with new batteries is brighter than a light that Illumins a swimming pool. ..the light in the pool is tired because it's state of having to travel through water, even if the bulb is led it will not appear as bright under water. This happens because the liquid slows the photon down making the speed of light. ..actually change depending on the conditions where it can be observed..seth

The light appears less bright because the water absorbs some of the light and will filter out some colours, not because of the speed change

[yor_on]

you can make a very good argument for light not 'moving' at all. That's actually one of the best ideas I've seen, and it makes sense. Make a sheet, introduce time, then let something 'touch' that sheet. For someone 'living' on it those 'pinpricks' will 'move', creating a motion. And yes, it's a f*ng old thread, still interesting though.