JEE Main Physics question

Physics Oscillations JEE Main

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

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

In a lift falling freely with acceleration , the effective gravity inside the lift is , so

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Question ID VK-154764