50_standing - Lesson 50 Standing Waves Standing waves are just an extension of the concepts of resonance waves at boundaries and superpositioning

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Lesson 50: Standing Waves Standing waves are just an extension of the concepts of resonance , waves at boundaries , and superpositioning . Imagine again that you are shaking a slinky, but this time it is attached to a wall at the other end. Create a wave (starting with a crest) that travels down the length of the slinky. When it strikes the wall (which is a big density change), most of the wave will be reflected inverted (as a trough) according to the rules for waves at boundaries .. Now, as that reflected inverted trough is traveling back towards you, you have made the trough of the wave and are staring to make the next crest that is traveling away from you. The timing has to be just right ( resonance ), so that your incident crest meets the reflected trough in the middle of the slinky. As the crest and trough meet in the middle, there will be destructive interference according to superpositioning . In some spots along the slinky crests will meet crests, or troughs will meet troughs, causing
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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50_standing - Lesson 50 Standing Waves Standing waves are just an extension of the concepts of resonance waves at boundaries and superpositioning

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