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9. A stretched string is $$1 \mathrm{m}$$ long. Its mass per unit length is $$0.5 \mathrm{g} / \mathrm{m}$$. It is stretched with a force of $$\mathrm{f}$$ f a $$12 \mathrm{km}$$ lat $$2 \mathrm{km}$$. 20 N. It plucked at a distance of $$25 \mathrm{cm}$$ from one end. The frequency of note emitted by it will be $$\begin{array}{ll}\text { (1) } 400 \mathrm{Hz} & \text { (2) } 300 \mathrm{Hz} \\ \text { (3) } 200 \mathrm{Hz} & \text { (4) } 100 \mathrm{Hz}\end{array}$$

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[RPET 1999; RPMT 2002]


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