Question

The length of the simple pendulum which ticks seconds is:

A
0.5m
B
1m
C
1.5m
D
2m
Solution
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The correct option is B 1m
The time period of a simple pendulum is
T=2πLg
where L is the length of the pendulum.
or L=gT24π2
The time period of the simple pendulum which ticks seconds is 2s.
T=2s
Substituting in (i), we get

L=(9.8ms2)(2s)24×(3.14)2=1m

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