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Speed of light

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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