the speed of light: galileo galileo (italian) in early 1600s attempted to determine light’s...
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Albert Michelson in 1905 In 1905 Albert Michelson (American) made a very accurate measurement of light’s speed. He used a rotating, 8-sided mirror which sent light a distance of about 35 km away. The mirror had to rotate at times/min ( rot./s) for the light to make the journey away from the mirror and back to the mirror as it made 1/8 (.125) of a turn. To make 1/8 of a turn took x s, so light travelled m in x s which is a speed of x 10 8 m/s. The accepted value today is x 10 8 m/s