Hear pitch change due to motion and the Doppler effect

Turn a classic wave phenomenon into an unforgettable experience. Arbor Scientific’s Doppler Ball is an Arbor Scientific-exclusive demonstration that makes the Doppler effect audible and engaging. Inside the soft foam ball is a battery-powered buzzer—turn it on and play catch. Thrown fast enough, students clearly hear the pitch change as the ball moves toward and away from them. Swing it on a string to create a continuous, controlled example of frequency shift. Simple, safe, and memorable, it brings wave physics to life in seconds. (Two AAA batteries included; color may vary.)

Why Teachers Love the Doppler Ball

• Instant “aha” moment: Students hear the frequency shift immediately—no graphs or screens required.
• Versatile demonstrations: Use by throwing, catching, or swinging on a string for repeatable results.
• Quick setup: Built-in buzzer and included batteries mean it’s ready right out of the box.
• Arbor-exclusive design: Purpose-built for classrooms to demonstrate Doppler clearly and reliably.