Get students into the swing of things with the Doppler effect.

• Hear the change in frequency

The perfect demonstration of the Doppler effect in a classroom (with caution of course). Swing the Doppler effect apparatus and students will be able to hear the change in frequency. The buzzer is 92 dB while standing still, when spun a student can easily hear the shift in frequency.
Buzzer housing has a simple on/off switch and is constructed of rugged ABS plastic. The nylon cord is 2'8" attached to a rugged ABS handle 8.5" long and 1" diameter.

Demo comes with a 9V battery installed.