I AT&T; LTE 3:56 PM @ 27%,iO blackboard.sau.edu Problem 3 the following extract

Question

I AT&T; LTE 3:56 PM @ 27%,iO blackboard.sau.edu Problem 3 the following extract is from the Wikipedia page about the Si unit "meter Definitions of the mere since 1795 Absolute Relative Basis of definition Date uncertainty uncertainty Vemee part of one hatf of a meridian, measurement by Delambre and Mechain 796 0.5-0.1 mm10 0.05- 0.01 mm First prototype Metre des Archives platinum bar standard 1799 10 Platinum-iridium bar at melting point of ice (1st CGPM 1889 0.2-0.1 um 10 Platinum-ridium bar at melting point of ioe, atmospheric pressure, supported by two rollers (7th CGPM) 1927 na 1,650,763.73 wavelengths of light from a specified transition n knypton-86 (11th CGPM) 0.01- 0.005 m 1960 10- Length of the path travelled by light in a vacuum in Ymf a second (17th CGPM 10- Notice the evolution of the definition and the currently accepted definition since 1983 based on the speed of light. In not more than 2 sentences, reason why the current definition is more rigorous than previous definitions

Explanation / Answer

This is becaise the uncertainity in predicting the speed of light has been reduced drastically to 0.1nm(From micosacle to nanoscale) and the relative uncertainity of 10^-10.Until and unless some method comes which gives lesser uncerainity in predicting speed of light comes,this method will be used.

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