Speed of light

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The speed of light in vacuum is exact

c = 299 792 458 m/s

Explanation

This physical constant can be calculated as

where

µ₀ Magnetic constant

ε₀ Electric constant

History

Polish-American physicist Albert Michelson (1852 - 1931) and American chemist Edward Morley (1838 - 1923) are known for their accurate measurements of the speed of light.

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