(a) Neil A. Armstrong was the fi rst person to walk on the
Chapter , Problem 2(choose chapter or problem)
(a) Neil A. Armstrong was the fi rst person to walk on the moon. The distance between the earth and the moon is 3.85 3 108 m. Find the time it took for his voice to reach the earth via radio waves. (b) Someday a person will walk on Mars, which is 5.6 3 1010 m from the earth at the point of closest approach. Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves.
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