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mehran_kimi
mehran_kimi asked in Science & MathematicsPhysics · 1 decade ago

Wave Question!?

At a distance of 12 km, a 110 Hz horn, assumed to be a point source, is barely audible. At what distance would it begin to cause pain?

Thanks!

2 Answers

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  • Alexander
    Lv 6
    1 decade ago
    Favorite Answer

    At frequency 110Hz dynamic range is ~100dB

    (from 30dB audibility to 130dB pain threshold)

    http://en.wikipedia.org/wiki/Image:FletcherMunson_...

    Answer: 12km/10^5 = 12cm

  • active open programming
    Lv 6
    1 decade ago

    It wouldn't cause pain at any distance. Hertz are

    a measurement of frequency. Decibels are the

    measurement of audio magnitude(loudness).

    decibels=10log10( I/10^(-12) )

    Where I is the intensity relative to 10^(-12) which is

    sound intensity compared to threshold of hearing

    and {I, Io=10^(-12)} is measured using watts/m^2

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