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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.
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Reason : Free falling body has acceleration equal to acceleration due to gravity.
Solution:
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
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, $T=2 \pi \sqrt{\frac{l}{g-a}}$
In the case of free fall, $a=g$ then $T=\infty$ i.e., the time period of pendulum becomes infinite.
In the case of free fall, $a=g$ then $T=\infty$ i.e., the time period of pendulum becomes infinite.
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