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
Zero
b
T
c
1/T
d
None of these
answer is A.
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Detailed Solution
When lift falls freely effective acceleration and frequency of oscillations be zero geff=g-g=0 ⇒T'=2πlg-g=∞ , hence a frequency = 0.