Reply to post: Re: Speed of light

Halfords invents radio signals that don't travel at the speed of light

FrogsAndChips Silver badge
Boffin

Re: Speed of light

The metre is no longer defined as a number of wavelengths of emission lines (twas krypton, BTW). Since the 80's it's been defined as the distance travelled by light in a vacuum in 1/299792458 of a second, effectively fixing c.

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