The SI standard of length is based on: (A) the distance from the north pole to the equator along...
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0The SI standard of length is based on:
(A) the distance from the north pole to the equator along a meridian passing through Paris.
(B) wavelength of light emitted by \( \mathrm{Hg}^{198} \).
(C) wavelength of light emitted by \( \mathrm{Kr}^{86} \).
(D) the speed of light.
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