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Hey there!
Given,
Length of pendulum = 10 cm = 0.1 m
Let acceleration due to gravity be 10 m/s^2.
We know,
Time period = 2π√(l / g)
Time period = 2π√0.1 / 10)
Time period = 2π√1 / 100
Time period = 2π × 1 / 10
Time Period = π / 5 sec
Hence option (1) π / 5 sec is correct..
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