PURPOSE: To demonstrate resonance in a closed tube, and to show that noise contains a large range of frequencies..

DESCRIPTION: Noise played from an audiocassette comes out the speaker on top of the player. As the length of the tube is increased, the resonant frequency can be easily observed to become lower.

SUGGESTIONS: See Question of the Week #271 and #272 for information on using this demonstration to enhance class involvement.

REFERENCES: (PIRA unknown.)

EQUIPMENT: Tape player with noise audiocassette, steel tube with cardboard outer tube.

SETUP TIME: None.