(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 x 108 m. Find the time i

Question

(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 x 108 m. Find the time it took for his voice to reach earth via radio waves. (b) Someday a person will walk on Mars, which is 5.6 x 1010 m from earth at the point of closest approach. Determine the minimum time that will be required for that person’s voice to reach earth.

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Hưng Khoa 5 years 2021-08-18T17:37:19+00:00 1 Answers 71 views 0

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  1. Cherry
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    2021-08-18T17:38:34+00:00
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    Answer:

    a). 1.28333 seconds

    b). 186.66 seconds

    Explanation:

    a). Given :

    Distance between the earth and the moon, d = $3.85 \times 10^8$ m

    Speed of the radio waves, c = $3 \times 10^8$ m/s

    Therefore the time required for the voice of Neil Armstrong to reach the earth via radio waves is given by :

    $t=\frac{d}{c}$

     $=\frac{3.85 \times 10^8}{3 \times 10^8}$

     = 1.28333 seconds

    b). Distance between Mars and the earth, d = $5.6 \times 10^{10}$ m

       Speed of the radio waves, c = $3 \times 10^8$ m/s

    So, the time required for his voice to reach earth is :

    $t=\frac{d}{c}$

     $=\frac{5.6 \times 10^{10}}{3 \times 10^8}$

     = 186.66 seconds

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