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Homework Help: Reflection of sound

  1. Dec 10, 2003 #1
    i read in the book. it stated that sound can be reflected by a barrier and the barrier must be large ( 10metre or more ).

    why?
     
  2. jcsd
  3. Dec 11, 2003 #2

    Chi Meson

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    In general, waves don't interact much with barriers that have a width that is smaller than the wavelength of the wave.

    The "why" for this is a longer explanation.

    a wavelength of 10 meters is a low frequency sound; you could hear a hand-clap echoing off a wall smaller than that. FOr any echo of voice, you would want at least a 5 m wall, but the larger the better.
     
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