Video: Watch this demo
Description: This demonstration illustrates the Doppler effect.
First, connect the buzzer to the battery and swing it around your head gently. Students should hear the Doppler effect.
Next, with the buzzer still on, put it in the foam ball and zip it up. This ball can be thrown around the room to further
illustrate the Doppler effect of a moving object.
Note: The connection to the buzzer has been known to be loose at times. Make sure a good connection is made.