Why not 1/300,000,000 or something different constant ( why only light ) ?
In: Physics
Adding on to what other people said; it used to be the case that the meter was defined as the length of a particular metal bar whose sole purpose was to be exactly 1 meter long.
If we were to use that same standard today, we would an interesting problem. Obviously, we would need to put error bars around the speed of light. By itself, this is not unreasonable, as the speed of light is an empirical physical constant. However what is weird is the source of those error bars. The biggest source of error in measuring the speed of light would be measuring the meter stick.
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