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    Calculating the speed of an approaching vehicle given the frequency of a car horn

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    A student in a parked car honks the horn, which has a `proper' frequency of 300 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 329 Hz. Calculate the speed of the approaching vehicle. Use 343 m/s as the speed of sound in air.

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    Solution Preview

    This is a problem related to the Doppler Effect.
    <br>The relevant formula is
    <br>fprime = f * (v +/- deltav) / v
    <br>where fprime = apparent freq. (Hz)
    <br> f = true ...

    Solution Summary

    A problem related to the Doppler Effect is demonstrated.