ocr: What is sound? Sound, like light, is a type of energy that can travel from one place to another. All sounds are caused by vibrations. When a ball strikes the ship's bell, its walls start vibrating rapidly, pushing to and fro on the surrounding air molecules. BELL PRESSURE WALL WAVE Waves ofvibrating air molecules When the walls of the bell move outward, they squeeze air molecules near them closer together. An area of high air pressure forms which travels away from the bell. The walls of the bell then move inward, pulling nearby air molecules away from one another. This creates an area oflow pr ...
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