Spinning Whistler - Physics Demonstrations - Spinning Whistler | Physics Undergraduate Labs

Ensure adequate clearance (at least 2-meter radius) around the demonstration space. The spinning whistler can become a projectile if the string breaks or is released. Maintain a firm grip on the string and keep students clear.

Purpose

A hollow metal cylinder with a longitudinal slit is spun on a string, producing a high-pitched whistle. Faster spinning raises the pitch, demonstrating the relationship between edge velocity and sound frequency.

Small yellow metal cylinder decorated with a cartoon parrot and musical notes, attached to a long white string, lying on a gray surface

Figure 1: Spinning whistler: a slotted metal cylinder on a string. Spin it overhead to produce a whistling tone that rises with rotation speed.

Safety Warnings

Warning: Clear Demonstration Area

Purpose