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Question

If the time period of a pendulum is 25s. What is the frequency of the pendulum?

A
4×102Hz
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B
4×101Hz
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C
25×102Hz
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D
2×102Hz
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Solution

The correct option is C 4×102Hz
That time period (T) of an oscillating body, like a pendulum, is the time spent in completing one full oscillation. The frequency (f) is the number of oscillations performed in one second. Mathematically, the frequency is the reciprocal of the time period. If T=25 seconds then f=125 i.e. 4×102Hz

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