Question

A pendulum clock is running fast. To correct its time, we should ______ 

Options

• reduce the mass of the bob.

• reduce the amplitude of oscillation

• reduce the length of the pendulum

• increase the length of the pendulum

Answer 1

A pendulum clock is running fast. To correct its time, we should increase the length of the pendulum.

Explanation:

The period of a simple pendulum is given by

`T = 2pisqrt(ℓ/9)`

∴ T ∝ `sqrtℓ`

The period of oscillation will increase if the length is increased.