Consult Maxwell's Equations. It is derived from electrical and magnetic constants.
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No, the speed of light is 186,282.4 miles per second. The speed of sound at sea level is about 0.2114 miles per second.
Since a microsecond is a millionth of a second, just divide the distance light travels in one second, by a million.
The speed of light is 186,000 miles per second in a vacuum.
186000 miles speed of light per second x 60 seconds in a minute x 60 minutes in one hour x 24 hours in one day = 16'070'400'000
The speed of light is 186,282 miles per second.