How long is one meter?

The metre (International spelling as used by the International Bureau of Weights and Measures), or meter (American spelling), (SI unit symbol: m), is the fundamental unit of length (SI dimension symbol: L) in the International System of Units (SI). What has been the definition of the meter since \(1983\) by the International System of Units?

a) The length of the path traveled by light in a vacuum for \(\frac{1}{299,792,458}\) of a second

b) One ten-millionth of the distance between the earth's equator and the North Pole (at the sea level)

c) The length of a pendulum with a half-period of one second

d) \(1,650,763.73\) wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-\(86\) atom in a vacuum


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