Question

What is a meter based on the use of?

Answer 1

It comes from the value for the speed of light.

Explanation:

The speed of light in vacuum is defined to be

`299,792,458` `"m/s"`

This means that light, in a vacuum, will travel a distance of `299,792,458` meters in one second.

The definition of the length of the meter is defined from this value:

One meter is the distance light travels in a vacuum in exactly `1/(299,792,458)` second.