A) decrease the length 2 times
B) decrease the length 4 times
C) increase the length 2 times
D) increase the length 4 times
Correct Answer: D
Solution :
The formula for time period is \[T=2\pi \sqrt{\frac{l}{g}}\propto \sqrt{l}\] If the length is increased by four times, then time period will be doubled.
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