The periodic time of a simple pendulum of length $1\, m $ and amplitude $2 \,cm $ is $5\, seconds$. If the amplitude is made $4\, cm$, its periodic time in seconds will be
A$42.5$
B$5$
C$10$
D$5\sqrt 2 $
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B$5$
b (b) As periodic time is independent of amplitude.
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