Economy Resonance Tube

Product Code: WA-9495


Students will have no difficulty hearing resonant frequencies from this tube. Two nested cardboard tubes allow the length of the air column to be easily varied. And the inner tube contains a removable end-cap to change from a “closed” to an “open” tube. The length of the resonating column can be read directly off the metric scale for both open and closed operation.


  • A removable 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.


  • Determine lengths of the tube at which resonance occurs when the frequency is constant.
  • Determine the frequencies at which resonance occurs when the length of the tube is held constant.
  • Determine the speed of sound in air.
  • Find the relationship between closed-tube and open-tube resonant lengths.

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.

What’s Included

  • 1 x Outer Tube (length 1.3 m; diameter 0.15 m)
  • 1 x Inner Tube (includes measuring tape and removable end-cap)
  • 2 x Tube Stands

Product Specifications

Outer tube length 1.3 m
Inner tube length 1.3 m
Outer tube diameter 0.15 m

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