Question

Two simple pendulums A and B have equal length, but their bobs weigh 50 gf and 100 gf respectively. What would be the ratio of their time periods ? Give reason for your answer.

Answer 1

Time period of simple pendulum can be given as
$T=2\pi \sqrt{\frac{L}{g}}$
So we can see time period of simple pendulum does not depend on mass of bob.
Being g as constant, weight of bob varies because of mass only. So ratio of their time periods will be 1:1.

It is because time period is independent of the mass of bob.