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Q)

In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to $\frac{3}{4}^{th}$ of the original length and the tension is changed. The factor by which the tension is to be changed is :


( A ) $\frac{3}{8}$
( B ) $\frac{2}{3}$
( C ) $\frac{8}{9}$
( D ) $\frac{9}{4}$

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A)
Answer : D 9/4
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