Re: speed of light versus c, again
- From: Tom Roberts <tjroberts@xxxxxxxxxx>
- Date: Thu, 29 Dec 2005 11:26:33 -0600
Josef Matz wrote:
"Tom Roberts" <tjroberts@xxxxxxxxxx> schrieb im Newsbeitrag news:NGGsf.41206$q%.6282@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxc is the _local_ limiting speed
for any material, energy, or information transfer.
let away information transfer. We know that it can be double the speed of light. And it can be near infinite on short distances.
No, we _DON'T_ know that. In fact, no experiment has ever shown propagation of energy or information > c over any distance. Yes, group velocity can be > c, but no _information_ or _energy_ is transferred at that speed.
In all cases where group velocity > c, to observe it requires the underlying waves be present beforehand, including all information and energy they carry. If the group approaches the waveFRONT from behind, the group DISAPPEARS as it reaches the FRONT.
the front velocity of any EM wave never exceeds c, and both energy and information transfer travel at the front velocity.
That statement is simply not true.
You _REALLY_ need to learn about the topic before making such statements. What I said is true, and your claims are not. My saying so is not definitive; what matters is actually going and READING about the experiments and the theory.
> A signal travels with group velocity.
Not true -- when approaching the FRONT from behind, the group disappears as it overtakes the FRONT. There is no group if there is no wave, and the front of the wave travels with the FRONT velocity, which is always <= c. <shrug>
Tom Roberts tjroberts@xxxxxxxxxx .
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