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NEET2003PhysicsOscillationsActual

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

Options

  1. Aif both assertion and reason are true and the reason is the correct explanation of the assertion
  2. Bif both assertion and reason are true and the reason is not the correct explanation of the assertion
  3. Cif assertion is true but reason is false
  4. Dif both assertion and reason are false statements.

Correct answer

C. if assertion is true but reason is false

Step-by-step solution

The amplitude of an oscillating pendulum decreases with time because of friction due to air. Frequency of simple pendulum is given by f= 1 2 g l which is independent of amplitude and so even though the frequency remains the same, the amplitude keeps on decreasing till it becomes zero.

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