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Physics 9 Online
OpenStudy (anonymous):

Suppose Galileo and his assistant were 1 km apart when Galileo uncovered his lantern to try to measure the speed of light. How long would it have taken the light signal to reach his assistant? 1.0 s 3.3 × 10^-6 s 3.0 × 10^8 s 3.3 × 10^-9 s

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