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27 April, 10:20

The distance from Earth to the Moon is approximately 240.000 mi Part C The speed of light is 3.00 x 10 m/s How long does it take for light to travel from Earth to the Moon and back again? Express your answer using two significant figures.

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  1. 27 April, 14:17
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    2.6 sec

    Explanation:

    The distance between the Earth and the moon = 240,000 miles

    Also,

    1 mile = 1609.34 m

    So,

    Distance between the Earth and the moon = 240,000 * 1609.34 m = 386241600 m

    Speed of the light = 3 * 10⁸ m/s

    Distance = Speed * Time.

    So,

    Time = Distance / Speed = 386241600 m / 3 * 10⁸ m/s = 1.3 sec

    For back journey = 1.3 sec

    So, total time = 2.6 sec
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