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Since 1983 the Standard Meter Has Been Defined in Terms

Question 18

Multiple Choice

Since 1983 the standard meter has been defined in terms of which of the following?​


A) specific alloy bar housed at Sevres,France
B) wavelength of light emitted by krypton-86
C) distance from the Earth's equator to the North Pole
D) the distance light travels in a certain fraction of a second
E) None of the above

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