A wire frame in the shape of an equilateral triangle is hinged at one vertex so that it can swin...

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A wire frame in the shape of an equilateral triangle is hinged at one vertex so that it can swing freely in a vertical plane, with the plane of the triangle always remaining vertical. The side of the frame is \( 1 / \sqrt{3} \mathrm{~m} \). The time period in seconds of small oscillations of the frame will be \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
\( \mathrm{P} \)
(a) \( \pi / \sqrt{2} \)
(c) \( \pi / \sqrt{6} \)
(b) \( \pi / \sqrt{3} \)
(d) \( \pi / \sqrt{5} \)
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