Why do string instruments need hollow bodies?

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Hardly any waves form when you move a thin rod back and forth in water because it mostly cuts through the water. Similarly, a string instrument’s strings have a hard time making waves in the air because it mostly cuts through it. Since wider objects can produce waves more easily, string instruments are made with a deep, wide, hollow body that vibrates, which then vibrates the surrounding air to amplify sound. Read full article here

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