Sound Tubes

Principle of Science: Longitudinal Sound Waves

Stand at each end of a tube and speak to be easily heard by listeners at the other end.

Participants can clearly speak to each other despite background noise because their voices are carried by sound waves moving through the air in the tubes. Sound moves through air causing air molecules to vibrate back and forth. This back and forth motion is referred to as a transverse wave. It is very similar to a pulse traveling the length of a stretched slinky. The vibrating air inside the Sound Tubes is contained within the walls of the tube and cannot spread out any further. The walls of the tube also protect the wave from being disturbed by sounds outside the tube.