If the length of a simple pendulum is doubled then the % change in the time period is :
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T=2pi * root l/g
Time period is directly proportional to root of length so if length is doubled time period changes
T1/t2 =1/1.41
Now calculate percentage change and get your answer
Time period is directly proportional to root of length so if length is doubled time period changes
T1/t2 =1/1.41
Now calculate percentage change and get your answer
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