3D30.40 - Helmholtz Resonator

Code Number:
Demo Title:
Helmholtz Resonator
Resonance in Pipes
Area of Study:
Brass Helmholtz Resonator, Glass Helmholtz Resonators, Sea Shell, Variable Resonator, and Homemade Resonator.

No preparation necessary other than occasional oiling of the variable resonator.

CAUTION: The glass resonators are very fragile!!

The Sea Shell is not a Helmholtz Resonator.  The air volume of the shell will be exited at the shells resonant frequencies, of which there should be several.  This shell has several resonances at frequencies below 300 Hz.

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  • Martín Monteiro, Arturo C. Marti, Patrik Vogt, Lutz Kasper, and Dominik Quarthal, "Measuring the Acoustic Response of Helmholtz Resonators", TPT, Vol. 53, #4, Apr. 2015, p. 247.
  • Thomas B. Greenslade Jr., "Apparatus Named After Our Academic Ancestors, III", TPT, Vol. 52, #6, Sept. 2014, p. 360. 
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  • Bruce Denardo and Miguel Bernard, "Design and Measurements of Variably Nonuniform Acoustic Resonators", AJP, Vol. 64, #6, June 1996, p. 745.
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  • Gerard L'E Turner, Nineteenth-Century Scientific Instruments, p. 142 - 143.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.