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    type of interference

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    A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?
    a: constructive
    b: destructive
    c: both constructive and destructive
    d: neither constructive nor destructive.

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    Solution Preview

    First, we use the wave equation to determine the wavelength of the sound produced by the speakers:

    c = f*l

    where c is the speed of sound, f is the frequency, and l is the wavelength. Re-arranging gives us:

    l = c/f = (330 m/s)/(200 Hz) = 1.65 m

    At the listener's location, the cycle of the wave is determined by the distance from the speaker divided ...

    Solution Summary

    The type of interference is revealed for a given situation. The person which stands between two speakers driven by the same source are given.