Why all the stringed instrumesnt are provided with boxes?
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The stringed instruments are provided with hollow boxes in order to increase the surface area of vibration, which increases the loundness/intensity (I) of the sound produced [As I is proportional to a]. Moreover, the air inside the hollow box is set into forced vibration which also increases the loudness of sound produced
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Musical instruments are provided with a hollow box. eg- guitar. In the musical instruments ,if the string is set into vibration ,the forced vibrations are produced in the air inside the box. Since area of the hollow box is large ,so it sets a large volume of air into vibration of the same frequency as that of string.
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