A) 3T
B) 3/2T
C) 4T
D) 2T
Correct Answer: A
Solution :
\[T=2\pi \sqrt{\frac{l}{g}}\] Þ \[T\propto \sqrt{l},\] hence if l made 9 times T becomes 3 times. Also time period of simple pendulum does not depends on the mass of the bob.
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