The length of the simple pendulum which ticks seconds is

Explanation

`T= 2pi sqrt((L)/(g))`
`L = ( gT^(2))/( 4pi^(2))`
`= ( 9.8 xx 2^(2))/( 4 xx ( 3.14 )^(2))`
`= 1 m` ( As time period of a seconds pendulum (i.e., the pendulum which ticks seconds ) is 2s )