Measurement

[needimprovement]

We know that at the time, the constant for a yard was the length from the King of Englands nose to the tip of his fingers.

 

What constant is the basis for the meter?

[DJBruce]

Distance traversed in vacuum by light in 1/299792458 of a second (17th CGPM )

 

Metre: Wikipedia

[needimprovement]

Metre: Wikipedia

I'll have to make the next one tougher!

[DJBruce]

I'll have to make the next one tougher!

 

A riddle really is not that hard, if you base it on a well known fact. But for your effort have a +.

[needimprovement]

A riddle really is not that hard, if you base it on a well known fact. But for your effort have a +.

Thank you. So technically, the meter is defined as the length of the path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second, defined at the 17th CGPM in 1983.

 

So, my next question will likely be what is a second?

[DJBruce]

 

the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

 

Here's my source

 

[Guest mabil]

Interesting question... and ultimately the answer is one of the best!!