Oscillations and Waves > Waves > Doppler Effect DCS# 3B40.10

AUDIO DOPPLER BALL

doppler ball

APPARATUS
whiffle ball with buzzer 202-14-E5

DESCRIPTION
This is a whiffle ball with a piezo-electric tone generator and batteries inside.  When the ball is switched on and thrown around, the Doppler shift of frequency can just barely be heard.  The change in frequency is also evident when the ball is swung in a circle by the attached parachute cord.