The accuracy in the measurement of time for 20 oscillations of a pendulum for the following measurement t1=39.6s , t2=39.9s and t3=39.5 s , is
A)±0.2s
b)±0.3s
c)±0.5s
d)±0.4s
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Please answer the question in detail
correct option is A)±0.2s
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