Question

define standard metre.
Its urgent..​

Answer 1

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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Answer 2

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$\bf{\pink{Define \:standard\: metre.}}$
The basic unit of length in the metric system; it was originally planned so that the circumference of the Earth would be measured at about forty million meters. A meter is 39.37 inches. Today, the meter is defined to be the distance light travels in 1 / 299,792,458 seconds.

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