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    Electromagnetic Waves: Radio Message from Mars

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    At its closest approach, Mars is 56 million km from Earth. How long would it take to send a radio message from a space probe of Mars to earth when the planets are at this closest distance?

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    Solution Preview

    Because, distance between earth and mars s= 56million km = 56*10^(6+3) m
    s ...

    Solution Summary

    Distance between earth and mars:
    s = 56million km
    = 56*10^(6+3) m
    = 5.6*10^(10) meters

    Speed of radio waves in free space c = 3*10^8 m/s