Physics 212 Lecture: "Wave Inteference." Feb 9, 1998

• The Principle of Linear Superposition states the when several waves interfere, the resulting wave is the sum of each input wave.
• Constructive interference occurs when waves with the same wavelength are in phase.
• Destructive interference occurs when waves with the same wavelength are out of phase.
• Either constructive or destructive interference can occur, depending on the position of a listener related to the sources.
• Beats are slow variations in overall amplitude which occur when two waves of slightly different frequencies interfere.

This lecture discusses material in Chapter 17 of Cutnell and Johnson.

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Copyright © Michael Richmond. This work is licensed under a Creative Commons License.