The length of a simple pendulum is 39.2π2m. If g=9.8m/s2, the time period of pendulum is
A
2s
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B
8s
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C
4s
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D
3s
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Solution
The correct option is C4s Given, Length of simple pendulum (l)=39.2π2m acceleration due to gravity (g)=9.8m/s2 Time period (T)=2π√lg =2π√39.29.8×π2 =4s