Sound wave thru a tube question

AI Thread Summary
The discussion centers on the impact of tube diameter on sound wave propagation. The two tubes, while equal in length, differ in diameter, with one maintaining a consistent 4" diameter and the other expanding to 5" for part of its length. When sound waves travel through the expanding section, they undergo changes that affect their characteristics. As the sound waves re-enter the 4" section, they are altered again, likely resulting in a different sound profile at the exit. The consensus is that the sound exiting both tubes will not be the same, potentially leading to a lower tone from the tube with the diameter variation.
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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.
 
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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.
 
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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