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In 1983 the Standard Meter Was Redefined to What It

Question 43

Multiple Choice

In 1983 the standard meter was redefined to what it is currently.What was the previous definition from 1960 based on?


A) specific alloy bar housed at Sevres,France
B) wavelength of light emitted by certain krypton atoms
C) distance from the Earth's equator to the North Pole
D) the distance light travels in a certain fraction of a second

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