What is the frequency heard by a person driving at 15 m/s toward a factory whistle emitting a frequency of 800. Hz? (speed of sound th

Question

What is the frequency heard by a person driving at 15 m/s toward a factory whistle emitting a
frequency of 800. Hz? (speed of sound that day 340. m/s)

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Tryphena 2 months 2021-07-23T07:59:27+00:00 1 Answers 4 views 0

Answers ( )

    0
    2021-07-23T08:00:38+00:00

    Answer:

    835.29 Hz

    Explanation:

    When moving towards the source of sound, frequency will be given by

    f*=f(vd+v)/v

    Where f is the freqiency of the source, vd is the driving speed, v is the speed of sound in air, f* is the inkown frequency when moving forward.

    Substituting 800 Hz for f, 340 m/s for v and 15 m/s for vd then

    f*=800(15+340)/340=835.29411764704 Hz

    Rounded off, the frequency is approximately 835.29 Hz

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