Paul Andersen explains how waves interact with objects and other waves. When a wave hits a fixed object, it will be reflected and inverted. When a wave hits a free object, it will be reflected without being inverted. [6:24]

In this video, Paul Andersen explains how constructive and destructive interference can create interference patterns. Interference patterns can be created by all types of waves, including water, sound, and light. A classic experiment...

In this video David derives the formula for beat frequency. [9:54]

In this video David explains what constructive and destructive interference means as well as how path length differences and pi shifts affect the interference.

David explains wave interference and solves a few examples to find the value of the total wave when two wave pulses overlap. [7:24]