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This video shows two crests colliding with each other. This is called constructive interference. When the two crests collide for he moment, they combine to create one bigger wave
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this video demonstrates destructive interference where a crest collides with a traugh. When they collide they cancel each other out.
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in this last video, we attempted to create a standing wave. In the video you can see the nodes where the destructive interference occurs, and also the crests and traughs where you can see the current nsttuctove interference.