Question

Assertion: Time period of a simple pendulum having copper bob is more as compared to iron bob, if both are maintained at same temperature. Reason: Co efficient of linear expansion for copper is more than that of iron.

Consider simple pendulum — a small bob of mass m tied to an inextensible massless string of length L. The other end of the string is fixed to a rigid support. The bob oscillates in a plane about the vertical line through the support. Let θ be the angle made by the string with the vertical.