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The length of a pendulum changes from `1m` to `1.21m`. The percentage change in its period is

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The length of a pendulum changes from `1m` to `1.21m`. The percentage change in its period is
A. `20%`
B. `21%`
C. `10%`
D. `11%`
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Correct Answer - C
`(T_(2))/(T_(1))=sqrt((l_(2))/(l_(1)))=sqrt((1.21)/(1))=1.1`
`(T_(2)-T_(1))/(T_(1))=1.1-1=0.1=10%`
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