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In 1983 the official length of one metre was established as what?

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In 1983 the official length of one metre was established as what?
posted Jan 15, 2018 by Naveen Kumar

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1 Answer

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The length of the path travelled by light in vacuum during 1/299 792 458 of a second. The 1983 definition is the current one; however, all the other options have been definitions of the metre at various times.

answer Jan 16, 2018 by Naveen Kumar
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