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Why does a tubes length affect wavelength of soundwave?

  1. Feb 3, 2007 #1
    In a wind instrument for example. Wouldn't a longer tube simply allow more compressions/rarefactions to be moving through the tube at any one time? Why does the wavelength change?
     
  2. jcsd
  3. Feb 3, 2007 #2

    Doc Al

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    Staff: Mentor

    Because only only certain wavelengths--ones that depend on the length of the tube--get reinforced enough to persist. Other wavelengths quickly die out. Read about how standing waves are formed here: Standing Waves
     
  4. Feb 3, 2007 #3

    Astronuc

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    Staff: Mentor

    If one tube has length L, and another tube has length L+l,where l is the wavelength, then L+l has one more wave in the tube, but the speed of propagation (speed of sound) is a property of the gas in the tube, not the length of the tube.
     
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