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In a sonometer, two adjacent wires of ...

In a sonometer, two adjacent wires of the same material are stretched under the same tension. The first wire is thicker than the other. The corresponding frequencies of length `l_(1) and l_(2)` of the sonometer wires are in unison with a tuning fork. Which of the following is correct ? Give reasons.
(i) ` l_(1) = l_(2)`
(ii) ` l_(1) lt l_(2)`
(iii) `l_(1) gt l_(2)`

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