Two Source Sound Interference, Oscillating - Physics Demonstrations - Two Source Sound Interference, Oscillating | Physics Undergraduate Labs

While these speakers have limited output, prolonged exposure to the rotating interference pattern at high volume can be fatiguing. Keep demonstration duration to 2-3 minutes per run and maintain volume at comfortable conversation levels. If students report discomfort, reduce amplitude immediately.

Purpose

Two speakers driven in phase on a rotating bar create a spatial interference pattern that sweeps across the room. Students hear alternating loud and quiet regions, directly experiencing constructive and destructive interference from coherent sources.

Safety Warnings

Warning: Sound Level Management

Purpose