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Why all the stinged instruments are prov...

Why all the stinged instruments are provided with hollow boxes?

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The stringed instruments are provided with hollow boxes in ofrder to increase the surface are (a) of vibration, which increases the loudness `//` intensity (I) of the sound produced `[As I propa]`. Moreover, the air inside th hollow bos is set into forced vibrations which also increases the loudness of sound produced.
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