Standing Waves
This interactive CDF document shows how the superposition of waves moving in opposite direction creates standing waves for different boundary conditions (hard and soft)
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CDF Interactive Document
Open it with Mathematica or the free CDFPlayer
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Basketballs as spherical acoustic cavities
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Videos:
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Demonstrations:
Resonance in Open and Closed Pipes from the Wolfram Demonstrations Project by Enrique Zeleny
Traveling Longitudinal Pulses and Standing Waves from the Wolfram Demonstrations Project by José Luis Gómez Muñoz
Links: