Resonance Apparatus – Speed of Sound & Air Column Resonance Demonstrator

The Resonance Apparatus is a versatile and reliable tool for teaching and investigating the resonant behavior of air columns. Students can explore how sound waves interact with an enclosed air column and use experimental data to determine the speed of sound in air.

This apparatus consists of a clear cylindrical acrylic tube mounted vertically on a sturdy base and support rod. The tube is open at the top and closed at the bottom with a rubber stopper and hose barb. Flexible tubing connects the tube to a large water reservoir, allowing easy adjustment of the air column length by raising or lowering the reservoir.

When stimulated by a sound source—such as a tuning fork or tone generator (not included)—the air column resonates at specific lengths, producing noticeably louder sounds. Resonance points can be measured directly using the printed scale on the tube or recorded using probeware for deeper analysis.

Perfect for demonstrating the relationship between frequency, wavelength, and sound velocity, this apparatus makes abstract wave concepts tangible in any physics classroom.

Apparatus Setup: Acrylic resonance tube, support base, rod, and adjustable water reservoir

Variable Air Column: Change air column length by adjusting water level

Measurement Scale: Printed directly on the tube for precise readings

Educational Focus: Resonance, standing waves, frequency, wavelength, and speed of sound

Compatible Sound Sources: Tuning fork or tone generator (not included)