3D30.15 - Standing Waves in a Tube

Code Number:
Demo Title:
Standing Waves in a Tube
Standing Waves
Area of Study:
Meter Stick, Plexiglas Tube with Speaker in the End, Microphone, Amplifier, Stereo Mike Mixer, Frequency Counters (2), Wave Generator, and Tektronix 2235 Oscilloscope.

Place the tube in an upright position with the meter stick along side as shown to measure the distances between the microphone and the speaker.  Plug the microphone into the preamp and output the preamp to the oscilloscope input along with a frequency counter.  Be sure you have a good battery in the microphone.  Plug the wave generator into the amplifier and the other output of the generator into the frequency counter.  Plug the speaker attached to the tube into the amplifier speaker outputs. Information on the parameters of the tube and the frequencies and observed nodes will be found in the file.

Several things can be explored with the PVC pipe that has the holes in it.  Put a speaker at one end and a microphone at the other.  Using "Matlab" on the computer you can generate a ramping frequency and look at the spectrum received.  Plugging one or several holes will markedly change the spectrum.

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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.