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

As we know that

T = 2π \sqrt {l\over g }

where,

• T = Time period
• l = effective length of the pendulum
• g = acceleration due to gravity.

So we see that, time period does not depend on the weight of the bob.

As, lengths are equal so,

T₁ : T₂ = 1 : 1