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30 March, 20:00

The siren of an ambulance wails at 1395 Hz when the ambulance is stationary. What frequency will you hear after this ambulance passes you while traveling at 33.60 m/s? The speed of sound under the prevailing conditions is 343 m/s.

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  1. 30 March, 20:13
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    Answer: the frequency observed will be 1269.45hz

    Explanation: according to the doppler effect,

    Apparent frequency f' = (c / (c+u)) * f

    f = real freq of sound of moving sound source

    c = speed of sound in air

    u = speed of moving sound source

    f' = (343 / (343+33.6)) * 1395

    f' = 1269.45hz
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