~200,000km/s is the speed of light in fiber optics. Electromagnetic propagation ... | Hacker News

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		connicpu 7 months ago \| parent \| context \| favorite \| on: Can an email go 500 miles in 2025? ~200,000km/s is the speed of light in fiber optics. Electromagnetic propagation in copper is more like 99% c.

layer8 7 months ago [–]

The insulating material significantly decreases the propagation speed: https://en.wikipedia.org/wiki/Velocity_factor#Typical_veloci...

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