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Physics 21 Online
OpenStudy (anonymous):

Radio waves travel at the speed of light, 3.00 × 108 m/s. If you were to broadcast a question to an astronaut on the moon, which is 239,000 miles from Earth, what is the minimum time that you would have to wait to receive a reply?

OpenStudy (anonymous):

time =round-trip distance/speed of light.

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