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Sound wave thru a tube question

  1. Jan 22, 2007 #1
    I have two tubes. Both are 12 feet long. One is 4" diameter for its entire length. The other has a 4" diameter segment for 4 feet, expands to 5" diameter for 4 feet, then reduces back to 4" for the remaining 4 feet.

    If the same sound is injected into both tubes, will the sound exiting the far end of both tubes be the same ??? Any info would be helpful. Thanks.
  2. jcsd
  3. Jan 22, 2007 #2


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    Staff: Mentor

    What do you think? Is this homework?
  4. Jan 22, 2007 #3
    No. Because when the sound waves expand to 5", it's like starting with a whole new sound then it reenters the 4" section which changes the sound once more.
  5. Jan 22, 2007 #4
    This is not homework, its for a personal project. I am (obviously) not an engineer.

    So the sound exiting is different ? How ? Lower tone ?
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