Doppler Ball

Foam ball with buzzer audibly demonstrates the Doppler effect during motion.

• Soft foam ball with internal battery-powered buzzer

• Can be thrown or swung to observe doppler frequency shifts
• Two CR2032 batteries included

The Doppler ball is a safe, hands-on tool for demonstrating the Doppler effect in a classroom setting. By activating the internal buzzer and moving the ball, either by throwing it very fast or swinging it on a string, students can hear the change in pitch that occurs due to motion, illustrating how frequency shifts when a sound source moves relative to an observer.