Doppler Ball

Product Code : EL-PLE-11893

Quick Answer: The Doppler Ball is a plastic ball with a PP3 battery-powered tone generator and speaker inside, used to demonstrate the Doppler effect when whirled round in a large horizontal circle.

Last updated: October 2026

Key Features

• Plastic ball with an internal tone generator and speaker
• Powered by a PP3 battery
• Variable pitch and good output volume
• Whirled in a large horizontal circle to demonstrate the Doppler shift of a moving source

About This Product

The ball is whirled round in a large horizontal circle while it sounds a tone. Listeners hear the pitch change as the ball moves towards and away from them, which demonstrates the Doppler shift associated with a moving source.

Frequently Asked Questions

How is the Doppler Ball used?

The ball is whirled round in a large horizontal circle while its internal tone generator sounds, demonstrating the Doppler effect of a moving source.

What powers the Doppler Ball?

The tone generator and speaker inside the ball are powered by a PP3 battery.

Related: Physics Lab Equipment, Digital Sound Level Meter, Tuning Fork.

For a quotation on the Doppler Ball, contact School Lab China.