A pendulum has a period of $4$ seconds then its frequency will be

2.5 H z

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0.25 H z

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25 H z

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0.025 H z

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Solution

The correct option is B $0.25 H z$
The relation between time period (T) and frequency (f) is $f = 1 / T$
so, $f = 1 / 4 = 0.25$ Hz

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