Question

Assertion: The amplitude of an oscillating pendulum decreases gradually with time.
Reason: The frequency of the pendulum decreases with time.

• A. Both assertion and reason are true and reason is the correct explanation of assertion
• B. Both assertion and reason are true but reason is not the correct explanation of assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

Answer: (C)

Oscillation's damp down after some time, because of frictional forces acting on it. This is known as damping
. Damping is the term used to describe the loss of energy with each cycle of a oscillation. This occur's because of loss of heat due to air resistance or frictional forces.
However, fraction of energy lost is small. While frequency does not depend upon amplitude of oscillation.