Question

Define standard metre ​

Answer 1

Answer:

Step-by-step explanation:

The Academy chose the meridian definition. This defined one meter as one ten-millionth of the distance from the Equator to the North Pole. ... The definition of a meter has changed since 1791. Today, a 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

Answer:

the time interval is the length travelled by a particular shape or vaccume