A string of length \( 3 \mathrm{~m} \) and linear mass density \( 0.0025 \mathrm{~kg} / \mathrm{...
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0A string of length \( 3 \mathrm{~m} \) and linear mass density \( 0.0025 \mathrm{~kg} / \mathrm{m} \) is fixed at both ends. One of its
\( \mathrm{P} \) resonance frequency is \( 252 \mathrm{~Hz} \). The next higher
W resonance frequency is \( 336 \mathrm{~Hz} \). Then the fundamental frequency will be
\( \begin{array}{lll}\text { (1) } 84 \mathrm{~Hz} & \text { (2) } 63 \mathrm{~Hz} & \text { (3) } 126 \mathrm{~Hz} \text { (4) } 168\end{array} \) \( \mathrm{Hz} \)
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