Re: Need Doppler Demo

[karshner@stmarytx.edu (Karshner)]

> One of my colleagues wants to do a Doppler Effect demo for our annual Physics
> FunFest and doesn't like any of the standard demos we do in class--he doesn't
> think the effect is pronounced enough to be heard by our audience.  Does 
> anyone out there know of a tried and true demo that works particualrly well?
> We would appreciate hearing from you.  Thanks in advance.
Van, 
        I have a nice portable Doppler Effect Demo apparatus. It is a soldstate
tone generator (Radio Shack or any electronic supply sell them - they replace
buzzers.) It is glued to a small board with a nine volt battery attached, and a
hole through the board is connected to a string. When the battery is
connected it generates a pure tone, and swinging around your head generates
a nice Doppler
shift for the students, if your head is at the center you hear very little
change.
        I hope this helps.
Gary