Re: Singing pipes

[Sam Sampere <sampere@suhep.phy.syr.edu>]

On Wed, 19 Mar 1997, Swanson, Rick wrote:

> My favorite fun thing to do when interacting with students during this
> demo is to have a student hold an open paper bag.  You start the tube
> resonating and then declare that you will pour the sound into the bag. 
> When the tube gets horizontal,the sound stops and you have the student
> quickly close the bag to keep the sound in.  While everyone is watching
> the bag you ask the student to open it up to let the sound out.  When
> the student opens the bag you furtively move the tube back to vertical
> ... and the sound comes out of the bag!
>
> Cheers,
>
> Rick
here's Another twist to this.  First, pour the sound out.  To get the tube
singing again, you must add sound, so pour the sound back in.  In a few
seconds, the tube will be winging again until all the sound leaves.

Sam