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Old December 24th 17, 07:59 PM posted to,uk.d-i-y
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On 24/12/2017 20:43, Bill Wright wrote:
What are the parameters that set the speed of electromagnetic
transmission in a vacuum? I've googled everywhere but I can't find the
answer. It's easy enough to find the figure but WHY? Why not
29,979,245.8 metres per second or 2,997,924,580 metres per second?


Start here

then look up permittivity and permeability of free space