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NEET2018PhysicsOscillationsActual

Assertion : If a pendulum is suspended in a lift and lift is falling freely, then its time period becomes infinite. Reason : Free falling body has acceleration equal to acceleration due to gravity.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion.

Step-by-step solution

If a pendulum is suspended in a lift and lift is moving downward with some acceleration a , then time period of pendulum is given by, T=2 l g-a In the case of free fall, a=g then T= i.e., the time period of pendulum becomes infinite.

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