Question

The length of a seconds pendulum is

• A. 99.8cm
• B. 99cm
• C. 100 cm
• D. None of the above

Answer 1

Answer: (B)

99cm

Answer 2

$T=2\pi \sqrt{\frac{l}{g}}$ $\Rightarrow$ $l=\frac{g{{T}^{2}}}{4{{\pi }^{2}}}=\frac{9.8\times 4}{4{{\pi }^{2}}}$ $=99\,cm$