WAEC Physics 2011 Paper

Concept:The time period of a simple pendulum depends only on its length and the acceleration due to gravity.Explanation:For a simple pendulum, the period is given by $T = 2\pi\sqrt{\frac{l}{g}}$.This formula does not contain the mass of the bob.Both pendulums A and B have equal lengths and are in the same environment, so $g$ is the same for both.Therefore, their periods must be identical.Thus, $T_A = T_B$.Answer:$T_A = T_B$ (Option C).