PHYS 1C Lecture Notes - Lecture 7: Fundamental Frequency, Standing Wave, Superposition Principle

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18 Apr 2018
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This means that you add together their individual displacements. We can have constructive or destructive interference or in between. Sound waves from different sources can interfere with one another. We can assume that the sources of the sound waves start the same (ie are in phase) The cause of this interference is path length difference (r = r2 - r1) If the path length difference between the two waves is zero or some integer multiple of wavelengths then you will get constructive interference (loud sound) If the path length difference between the two waves is an odd half number of wavelengths then you will get destructive interference (little or no sound) When you have waves reflected back (such as on a rope or in air), these waves can interfere. At proper frequencies you can create standing wave (which have nodes and anti-nodes) Nodes are parts of the medium that do not move.

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