3E20.25 - Tooth Toons - Human Loudspeaker

Code Number:
Demo Title:
Tooth Toons - Human Loudspeaker
Speaker Construction and Sound Reproduction
Area of Study:
Magnets, Copper Coil on the end of a Wooden Dowel, Tape Player, and Plastic Straws.

Place a piece of plastic straw on the wooden dowel and bite down.  Turn the tape player on and bring the magnets close to the coil.  You should be able to hear the sound.

You may be able to hear sound through direct bone conduction.  Place the end of the wooden dowel against the skull bone behind the ear.  Again bring the magnet to the coil and sound should be heard.  You may need to move the dowel around to find the best conduction point.

  • Tom Senior, "Head Noises", TPT, Vol. 38, #1, Jan. 2000, p. 30.
  • Nicole Lou, "Listen To Records With Your Teeth", Popular Science, Vol. 288, #2, Mar/Apr. 2016, p. 86.
  • "W-425. Bite-a-Phone", DICK and RAE Physics Demo Notebook.
  • Don Rathjen and Paul Doherty, "Sound Bite", Square Wheels, 2002, p. 105.
  • Robert L. Wild, "Audio Coil Detector", Low-Cost Physics Demonstrations, #151, p. 88.
  • Sara Stein, "A Humming Skull and Other Ways To Hear Better", The Science Book, p. 181.

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.