What is the force that is actually pulling the wave down/pushing it up? I can find information talks about the medium used to create the wave can determine its frequency but not what is actually causing that pattern in particular as opposed to a straight line or even a loop d loop.
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It depends on what kind of wave you are talking about. In a sound wave, essentially you have a lot of particles moving front and back very quickly, that have been “jumpstarted” by some kind of energy imput (for example, the vibrating strings you use to speak), forming a pressure wave.
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