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    yasina's Avatar
    yasina Posts: 1, Reputation: 1
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    #1

    Aug 28, 2008, 06:49 PM
    Average speed and velocity
    Radio waves travel at a speed of light, approximately 186000 miles per second. How long does it take for a radio message to travel from earth to the moon and back?
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Aug 28, 2008, 07:11 PM
    Hello yasina

    Well, the average distance from Earth to the moon is 384.000 km.
    With the lightspeed being 300.000 km/sec, it takes a radio signal 1,28 second to travel one-way, and therefore 2,56 seconds to return back to earth.

    :>)
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