Answer:
\[\frac{{{l}_{1}}}{{{l}_{2}}}=\frac{T_{1}^{2}}{T_{2}^{2}}\] or \[\frac{l}{l/2}=\frac{2\times 2}{T_{2}^{2}}\] or \[T_{2}^{2}=2\] or \[{{T}_{2}}=\sqrt{2}s.\]
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