UIUC Physics Lecture Demo: Sound Wave Interference (Side to Side)

UIUC Physics
Lecture Demonstration
Database

Demo # 440

Sound Wave Interference (Side to Side)

ID # 440

Description:

A sound wave is produced by an amplifier and sent through two speakers. These speakers are set a distance apart (in this case one on either side of the lecture table). The two sound waves produce constructive and destructive interference patterns. Moving side to side (usually about 7 inches) in the lecture hall, a person can hear the nodes and antinodes of this interference as their ears pass through the different positions. This demo has two different setups.

Picture of Sound Wave Interference (Side to Side)

Physics Concept:

Waves
Sound
Interference & Diffraction

The demonstration takes about 1 minute to perform.

The demonstration has audience participation.