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Chapter 7: Waves I
1. Why This Matters
Drop a stone into a pond. Watch the ripples spread out in circles. That is a wave. Now think about the sound of a friend calling your name, the light from a screen you are reading, the radio waves carrying music to your car, and the microwaves heating your food. Every one of these is a wave.
Waves are everywhere. They are how energy travels from one place to another without matter being carried along. A wave is not a thing — it is a pattern of motion,