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Galileo attempted to measure the speed of light by measuring the time elapsed between his opening...

Galileo attempted to measure the speed of light by measuring the time elapsed between his opening a lantern and his seeing the light return from his assistant's lantern.

What distance, d, must separate Galileo and his assistant in order for the human reaction time, Δt = 0.2 s, to introduce no more than a 14 % error in the speed of light? Answer in meters.

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