Question

A pendulum clock is running slow, In order to correct it, we should

• A. reduce the amplitude of oscillation.
• B. reduce the mass of the bob.
• C. reduce the length of pendulum.
• D. increase the length of pendulum.

Hint:

A slow clock has too long a time period; T = 2 pi sqrt(L/g) so decrease the length.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
A clock that runs slow takes longer than it should for each swing, so its period is too large. The period of a simple pendulum is \(T = 2\pi\sqrt{L/g}\).

Step 2: Detailed Explanation
To reduce T we must reduce L. So we shorten the pendulum. This is (C).
The period does not depend on the amplitude (for small swings) or the mass of the bob, so (A) and (B) will not help. Increasing the length (D) would make the clock slower.

Final Answer:
Reduce the length of the pendulum, option (C). \[ \boxed{\text{Reduce the length}} \]