On 10/07/2017 14:02, [email protected] wrote:

> ~3 x 10**8 m/s
> 
> More importantly, what is the speed of light in a fiberoptic connection? 

~0.66c

> Speed of electrons in copper wire?

Individual electrons move *very* slowly - it's the electric *field* that
moves at between 0.5c and 1c.

https://en.wikipedia.org/wiki/Velocity_factor

cheers,

Ray

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