Originally posted by DeepThoughtAlright, because if he was right then there is a way to transmit informatin faster than light, and this is not possible due to Einstein.
In a wave the phase velocity can be arbitarily large, the group velocity is limited by the speed of light. I assume that is what he's talking about. If not then he's just wrong.
Scientists have been able to prove for years that an electric signal can travel up to four billion kilometres per hour while at it's peak.
But while the peak moves faster than light speed, the total energy of the pulse does not, thus meaning Einstein's relativity is preserved, so do not expect crazy-fast starships or time machines anytime soon.
Originally posted by FabianFnasCrucify him then. It's all Einstein's fault. Till he made up his rediculous rule, things were going faster than light all the time. Then 1905 hits and the fit hit the shan.
Alright, because if he was right then there is a way to transmit informatin faster than light, and this is not possible due to Einstein.
Originally posted by FabianFnasIt's the group velocity that counts for information and energy transfer. If you get a sufficiently strong laser and point it at the moon and move it from the north pole to the south then it's possible to get the image moving faster than light. You can find loads of these things. The EPR paradox is probably the most famous example.
Again: There is no limit in speed for transmitting information?
Originally posted by DeepThoughtOkay, then there's still no method of transmitting information faster than light. Einstein is still right.
It's the group velocity that counts for information and energy transfer. If you get a sufficiently strong laser and point it at the moon and move it from the north pole to the south then it's possible to get the image moving faster than light. You can find loads of these things. The EPR paradox is probably the most famous example.
a phenomenon can travel faster than the speed of light, and i don't just mean a concept. For instance, two great arcs through space interesect like scissors closing . .. the ionic photons produced and radiated, will, from a great distance away "look" like something that is traveling faster than the speed of light . . and, thus, indeed, something IS traveling faster than the speed of light . . the visual effect
Originally posted by coquetteBut you still can't use it to send information faster than C. Not even gravity can go faster than C. Big Al proved that.
a phenomenon can travel faster than the speed of light, and i don't just mean a concept. For instance, two great arcs through space interesect like scissors closing . .. the ionic photons produced and radiated, will, from a great distance away "look" like something that is traveling faster than the speed of light . . and, thus, indeed, something IS traveling faster than the speed of light . . the visual effect