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Date: 2011-10-03 14:10:01Metrology Metre Speed of light Laser Helium–neon laser Standard Atomic clock Wavelength Metric system Measurement Physics Electromagnetic radiation | Length—Evolution from Measurement Standard to a Fundamental ConstantAdd to Reading ListSource URL: www.nist.govDownload Document from Source WebsiteFile Size: 157,91 KBShare Document on Facebook |