Q. How does time period of a pendulum very with length?
A) $\sqrt{l}$
B) $\sqrt{\frac{l}{2}}$
C) $\frac{1}{\sqrt{l}}$
D) $2l$
Explanation
(a) Time period of pendulum $T = 2\pi\sqrt{\frac{l}{g}}$
$\therefore$ $T \propto \sqrt{l}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.