The SI unit of length is based on: (A) The distance from the north ...

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The SI unit of length is based on:
(A) The distance from the north pole to the
\( \mathrm{P} \) equator along a meridian passing through Paris
W
(B) Wavelength of light emitted by \( \mathrm{Kr}^{86} \)
(C) A precision meter stick in Paris
(D) The speed of light
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