define standard metre?
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-The Standard meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. ... The Standard meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second
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standard metre is the length of the path travelled by light in vaccum during a time interval 1/199 792 458 of a second.
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