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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