Physics Banter - View Single Post - Empirically Confirmed Superluminal Velocities?

**Randy Poe**

On 25 Oct 2003 03:57:23 -0700, (EL) wrote:

(Bilge) wrote in message ...

It's completely unnecessary to synchronize anything.

[EL]
Hi Bilge.

Why is it so difficult for people to imagine group velocities as wave
envelopes!

All decent empirical wave-group-velocity measurements show that they
are much lower than phase velocity in the same dispersive medium.

Except in negatively-dispersive media, where both theory and
experiment show the opposite.

- Randy