Define standard metre in terms of the velocity of light.
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The Unit – metre, m (mita) ... It follows that the speed of light in vacuum (c0) is exactly 299 792 458 metres per second (m/s). The 1983 definition defines the metre in terms of a fundamental constant, the speed of light in a vacuum
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The length of the path travelled by light in a vaccum during a time interval of a second
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