Cylindrical Pipes

 

Code Number: 3D30.32

Demo Title: Cylindrical Pipes

Area of Study: Oscillations & Acoustics

Equipment:

Several demo pipes are available.  Some with holes and some without.

Procedure:

The pipes with the holes down the length have a “band gap” like a semiconductor due to the periodic holes.  In musical instruments like a clarinet it is called the “tone-hole cut-off”.   Tone holes are not periodic, but the effect is similar.

References:

  •  J. W. Jewett, Jr., "AIr Column Resonance Spectra Using Basic Laboratory Equipment", AJP, Vol. 48, #1, Jan. 1980, p. 24.