3B55.45-Acoustic Interferometer

Description: By adjusting the length of one sound wave, you can find loud and quiet spots, corresponding to constructive and destructive interference.


  • Acoustic Interferometer
  • Tone Generator


  1. Push the end of the interferometer in all the way; both sides should be roughly the same length
  2. Put the speaker into one of the open ends
  3. Slide one of the sides of the interferometer until you hear loud nodes and quiet nodes.


  • The change in sound can be quiet, so having a microphone at the other open end of the interferometer makes the effect clearer.