A) 216s
B) 432s
C) 864s
D) 1728s
Correct Answer: C
Solution :
\[T=2\pi \sqrt{\frac{l}{g}},T'=2\pi \sqrt{\frac{98l}{100g}}\] \[\frac{T'}{T}=\sqrt{\frac{98}{100}}={{\left( 1-\frac{2}{100} \right)}^{\frac{1}{2}}}=\left( 1-\frac{1}{100} \right)\]by binomial theorem. \[\frac{1}{100}=\frac{T-T'}{T}=\]Change in time per second Change per day = Change in 86400 s \[=\frac{86400\times 1}{100}=864s\]
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