Second’s pendulum is a pendulum which executes one oscillation in: (1) Half a second (2) One second (3) Two seconds (4) None of these

Second’s pendulum is a pendulum which executes one oscillation in: (1) Half a second (2) One second (3) Two seconds (4) None of these
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(3) Two seconds Explanation: A pendulum is a weight suspended from a pivot so that it can swing freely. A seconds pendulum is a pendulum whose period is precisely two seconds; one second for a swing in one direction and one second for the return swing, a frequency of 1/2 Hz.
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Pendulum "A" swings through one complete oscillation in one second. If Pendulum "B" is four times as long as Pendulum "A", how long does it take Pendulum "B" to swing through one complete oscillation?

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Last Answer : not real

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