What is the length of a simple pendulum which ticks second?

Options

A. 1 m
B. 2 m
C. 3 m
D. 4 m

Answer

B

Explanation

The Time period of a simple pendulum is
`T=2pisqrt((l)/(g))orl=(gT^(2))/(4pi^(2))`
The time period of a simple pendulum, which ticks seconds, is 2 s.
`therefore l=((9.8m s^(-2))(2s)^(2))/(4pi^(2))=1m`