Experimenters at the National Institute of Standards and Technology have made precise measurements of the speed of light using the fact that, in vacuum, the speed of electromagnetic waves is c = 1/?(µ0?0), where the constants µ0 = 4? multiplied by 10-7 N · s2/C2 and ?0 = 8.854 multiplied by 10-12 C2/N · m2. What value (to four significant figures) does this give for the speed of light in vacuum?
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