Question

A pendulum of some length and a bob made of iron, has a time period $T_{iron}$. If another pendulum is made with the same length but with a copper bob, the new time period $T_{copper}$ would be equal to:

• A. $4.25T_{iron}$
• B. $1.75T_{iron}$
• C. $1.00T_{iron}$
• D. $0.55T_{iron}$

Answer 1

The correct option is C $1.00T_{iron}$

The time period of a simple pendulum is independent of the material of the bob used. So, in both the given cases, the time period would be the same.
The time period of the copper pendulum, $T_{copper}=T_{iron}$, the time period of the iron pendulum.