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How long does it take a radio signal from Earth to reach the Moon, which has an orbital radius of approximately 3.8410 m

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Answer:

2.4 to 2.7 seconds

Radio waves propagate in vacuum at the speed of light c, exactly 299,792,458 m/s. Propagation time to the Moon and back ranges from 2.4 to 2.7 seconds, with an average of 2.56 seconds (the average distance from Earth to the Moon is 384,400 km).

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