Question

Give the fundamental definition of 1 metre.​

Answer 1

Answer:

The metre is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second.” It follows that the speed of light in vacuum (c0) is exactly 299 792 458 metres per second (m/s).

hope this helps you dude ✌

Answer 2

Answer:

${ \bold{ \pink{One \: metre \: is \: the \: distance \: travelled \: by \: a \: light \: wave \: in \: { \red{\frac{1}{299792458}}} \: seconds .}}}$