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Question

The length of a second pendulum is

A

$$99.8\ cm$$

B

$$None\ of\ these$$

C

$$99\ cm$$

D

$$100\ cm$$

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Solution

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Correct option is B. $$99\ cm$$
$$T=2\pi \sqrt {l/g}$$

$$\Rightarrow l=\dfrac {gT^2}{4\pi^2}=\dfrac {9.8\times 4}{4\times \pi^2}=99\ cm$$

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