needimprovement Posted August 6, 2010 Share Posted August 6, 2010 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? 1 Link to comment Share on other sites More sharing options...
DJBruce Posted August 6, 2010 Share Posted August 6, 2010 Distance traversed in vacuum by light in 1/299792458 of a second (17th CGPM ) Metre: Wikipedia Link to comment Share on other sites More sharing options...
needimprovement Posted August 8, 2010 Author Share Posted August 8, 2010 Metre: Wikipedia I'll have to make the next one tougher! Link to comment Share on other sites More sharing options...
DJBruce Posted August 8, 2010 Share Posted August 8, 2010 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 +. Link to comment Share on other sites More sharing options...
needimprovement Posted August 10, 2010 Author Share Posted August 10, 2010 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? Link to comment Share on other sites More sharing options...
DJBruce Posted August 10, 2010 Share Posted August 10, 2010 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 Link to comment Share on other sites More sharing options...
Guest mabil Posted August 10, 2010 Share Posted August 10, 2010 Interesting question... and ultimately the answer is one of the best!! Link to comment Share on other sites More sharing options...
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