You are holding a siren, and you hear a frequency of 1200 Hz from it when you are standing still. You now move directly toward a cliff wall

Question

You are holding a siren, and you hear a frequency of 1200 Hz from it when you are standing still. You now move directly toward a cliff wall at a speed of 1/5 the speed of sound. What frequency do you hear as an echo from the cliff wall?

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Khải Quang 3 years 2021-08-02T05:18:12+00:00 1 Answers 3 views 0

Answers ( )

  1. thucuc
    0
    2021-08-02T05:19:56+00:00
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    Answer:

    F_w=1000Hz

    Explanation:

    From the question we are told that:

    Frequency F=1200

    Speed V_w= \frac{1}{5}*343=>68.6m/s

    Where speed of sound V_s=343m/s

    Generally the equation for frequency  that echo from the cliff wall is mathematically given by

    F_w=\frac{V_s-V_0}{Vs+V_w}*F

    F_w=\frac{343-0}{343+68.6}*1200

    F_w=1000Hz

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