📝 Multiple Choice Question
General-science
In 1960, which isotope was used to define the standard measure of length (the meter)?
A
Krypton-86
B
Krypton-88
C
Krypton-83
D
Krypton-90
Explanation
Between 1960 and 1983, the meter was defined by a specific number of wavelengths of orange-red light emitted by krypton-86.
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