[j5155]

Yes. As a more common example, fiber optic cabling is known to transmit information significantly faster then copper.

[chongli]

The speed of fibre optic cabling has more to do with signal integrity and bandwidth than any difference in propagation delay. In fact, in some cases a signal can travel faster on a copper wire (0.8c) than it can through an optical fibre (0.6c).

[sightbroke]

I am sorry if my experimental setup was not clear.

Copper is clearly a different medium than fiber optic.

That is why I stipulated a single medium for the experiment.