Susan R. Harris wrote:
Photons propagate at 0.65c in fibre - the exact speed does vary depending on whether its single or multimode fibre.
Hi Geoff - not to reveal my ignorance or anything, but ... is that 65 degrees celcius?
The equivalent EMR propagation speed in coppr is 0.75c
What is EMR?
Electro-Magnetic Radiation. The velocity will vary +/- ~10% depending on the type of material for the dielectric and dimension of the transmission line. Tim -- Snail: Tim Pozar / LNS / 1978 45th Ave / San Francisco CA 94116 / USA POTS: +1 415 665 3790 Radio: KC6GNJ / KAE6247 "It's a damn poor mind that can only think of one way to spell a word." - Andrew Jackson "What is wanted is not the will to believe, but the will to find out, which is the exact opposite." -- Bertrand Russell