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Old December 24th 17, 07:59 PM posted to uk.tech.digital-tv,uk.d-i-y
newshound[_3_]
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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?

Bill


Start here

https://en.wikipedia.org/wiki/Electr..._wave_equation

then look up permittivity and permeability of free space
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