Refraction: , Waves bend as they enter a new medium because they start traveling at a different speed in the new medium., , Reflection: , When waves strike an obstacle at any other angle, they bounce back at the same angle but in a different direction., Interference: The two waves pass through each other, and this affects their amplitude, Can be constructive or destructive, , , As the waves pass through each other, the crests and troughs cancel each other out to produce a wave with zero amplitude. , When the crests, or highest points, of one wave overlap the crests of the other wave., , Diffraction: , , , Occurs when waves pass through an opening in an obstacle.,

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