Sound wave thru a tube question

[steveo70]

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.

 

[russ_watters]

What do you think? Is this homework?

 

[linux kid]

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.

 

[steveo70]

This is not homework, its for a personal project. I am (obviously) not an engineer.

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