Prove that the velocity of the light is 3×10^8
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Since 1983, the speed of light has been defined as exactly 299792458 m/s.
From 1675 to 1983, the speed of light had been measured with steadily increasing accuracy, until it was realized that the limiting factor preventing further improvements in the accuracy of speed-of-light determinations was the meter standard itself.
From 1983 onwards, instead of improving speed of light measurements in terms of the standard meter, efforts have turned towards improving meter measurements in terms of the defined speed of light.
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