1√4 is correct answer.
What is frequency ?
The number of times the alternating current (AC) flips from positive to negative in a second is referred to as frequency. In direct currents, this switching does not take place (DC). Hertz is the unit of frequency (Hz). For instance, a current is said to have a frequency of 60 Hz if it switches from positive to negative 60 times per second.
A second's pendulum oscillates at a certain frequency and for a specific amount of time. The length of the pendulum and the acceleration brought on by gravity also affect the duration. As a result, the amplitude of the oscillation has no bearing on how the pendulum of a second oscillates.
If there is no atmospheric friction or air resistance, the pendulum's time period is also constant. The length of a pendulum in the moon will lengthen as its gravitational acceleration (g) value decreases.
At a location where the average gravity acceleration is g=9.8 m/s2, the effective length of the second's pendulum is close to one meter.
Here, the string is taken to be massless, and only the bob's mass is taken into account.
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