Question

If length of second pendulum becomes four times, then its time period will become :

• A. four times
• B. eight times
• C. two times
• D. same as before

Answer 1

The correct option is C two times

Time period of second pendulum is given by $T=2\pi \sqrt{\frac{l}{g}}$
$⟹T\propto \sqrt{l}$
Thus if the length if second pendulum is increased by 4 times, its time period gets increased by 2 times.