A simple pendulum is attached to the roof of a lift. If time period of oscillation, when the lift is stationary is $T$. Then frequency of oscillation, when the lift falls freely, will be
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(a) When lift falls freely effective acceleration and frequency of oscillations be zero
${g_{eff}} = 0$ $⇒$ $T' = \infty $, hence a frequency $= 0.$
${g_{eff}} = 0$ $⇒$ $T' = \infty $, hence a frequency $= 0.$
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