Economy Resonance Tube

Economy Resonance Tube

Students will have no difficulty hearing resonant frequencies from this tube. Two nested cardboard tubes with a removable inner stopper allow students to perform resonance experiments on both open and closed tubes.
Using the inner plunger tube to vary the length of the column of air within allows students to investigate the effects of length on the resonant frequencies. A measuring tape is mounted to the plunger tube to indicate the effective length.
Remove the plunger tube and an open tube of constant length remains for further investigations. Students can vary sound source frequency to investigate an open-tube resonant frequency pattern.

Features

• A removeable end cap on inner tube allows air column to act as either an "open" or a "closed" tube.
• A metric scale on the inner tube has two rows of measurements; one indicates resonating length when the plug is in place, the other for when the plug is removed.
• Convenient tube stands ensure that the tube does not roll off the table.

How It Works

Generate a pure sound wave several centimeters from the opening of tube. Vary the length of the tube or the frequency of the sound wave. When the tube is driven at resonant frequency, the sound is louder.