Interference

Science

Definition

The phenomenon that occurs when two or more waves overlap in the same space. Constructive interference happens when wave crests align, producing a larger amplitude. Destructive interference occurs when a crest meets a trough, reducing or canceling the wave.

Examples

  • Noise-canceling headphones using destructive interference to reduce unwanted sound
  • Colorful patterns on soap bubbles caused by thin-film interference of light
  • Two speakers producing loud and quiet zones in a room

Related Terms

Wave properties Standing waves Sound waves Refraction

Study This Concept

Practice interference with free review games in these units:

AP Physics 1 Unit 7: Waves and Sound