From: "Ash R. J. Wyllie" <[EMAIL PROTECTED]>
> Extracted from the mind of Iljitsch van Beijnum;
>
> >Yes, it is. Actually fiber is "slower" than copper: the speed of
light in
> >optical fiber is 200.000 km/s, while the speed of electricity in
copper is
> >300.000 km/s.
>
> The speed of light in glass is better than .9c (in vacuum). If you
know the
> index of refraction you know the relative speeds.
It's around 1.55 in the core of a multi-mode fiber (IIRC from my Physics
classes), about the same in single-mode, so the number quoted by
Iljitsch is about right, since v=c/n. 194 Mm/s is "more accurate" (in
the sense anything ambiguous can be).
> Electrons move at about .33c in copper wiring.
IIRC it's about .66c. There may be a formula somewhere, but...
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