In order to double the period of a simple pendulum, the length of the string should be
A. Halved
B. Doubled
C. Quadrupled
D. None of these
Answer: Option C
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As per Equation, T=2*3.14SQRT(l/g)
if we take value of l =4, then you will get same equation multiply by 2
so we can say that the length should be quadrupled.