The variation of amplitude A with respect to time t is shown as
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The variation of amplitude A with respect to time t is shown as
The variation of amplitude A with respect to time t is shown as
Correct option (b)
Explanation:
Ideal case: no damping: the amplitude remains constant. (third graph)
Practical case: damping is present: amplitude decreases exponentially. Assuming the damping force is directly proportional to velocity of the bob. We can write the amplitude : A = A0 e- bt/2m
Here b is damping constant and m is mass of the pendulum bob.
So the correct option is (b)