Define a standard metre
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“The metre is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second.” It follows that the speed of light in vacuum (c0) is exactly 299 792 458 metres per second (m/s).
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1
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The metre is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second.” It follows that the speed of light in vacuum (c0) is exactly 299 792 458 metres per second (m/s).
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