\(T=2\pi\sqrt{\dfrac{l}{g}};T'=2\pi\sqrt{\dfrac{l'}{g}}\)
\(\Rightarrow\dfrac{T}{T'}=\sqrt{\dfrac{l}{l'}}=\sqrt{\dfrac{1}{2}}=\dfrac{1}{\sqrt{2}}\)
\(\Rightarrow f'=\dfrac{1}{T'}=\dfrac{1}{T\sqrt{2}}\left(Hz\right)\)
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