Assertion : The amplitude of an oscillation pendulum decreases gradually with time
Reason : The frequency of the pendulum decrease with time

Options

A. If both assertion and reason are true and the reasopn is a true explanation of the assertion
B. If both assertion and reason are true and but the reason is not the correct explanation of assertion
C. If the assertion is true but reason is false
D. If both the assertion and reason are false

Answer

C

Explanation

The amplitude of an oscillation pendulum decreases with time become of friction due to air oscillation damp down after same time becomes of friction force acting on it This is known as damping is the term used describe the loss of energy with each cycle of an oscilation The octure because of loss of heat that to air resistence or frictional however frection of energy losss is small While frequency does not depends upon amplitude of oscillation frequency of pendulum is independent of amplitude.