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    Doppler effect: Frequency the car horns emit when one is at rest and the other moving

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    Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward an observer at 15.9m/s, a beat frequency of 5.60Hz is heard. What is the frequency the horns emit? Assume T= 20 degrees celsuis

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    https://brainmass.com/physics/doppler-shift/doppler-effect-frequency-the-car-horns-emit-when-one-is-at-rest-and-the-other-moving-11454

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    Solution/explanation:

    Step 1.
    When two sounds which differ slightly in frequency are received simultaneously, an observer hears the 'beat note' which is their difference. Let f be the frequency received from the stationary horn, and f' the frequency received ...

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