A) \[0.0012\,\,s\]
B) \[0.0025\,\,s\]
C) \[0.0015\,\,s\]
D) \[0.0010\,\,s\]
Correct Answer: B
Solution :
\[T=\frac{1}{n}=\frac{1}{400}=\frac{1}{4}\times {{10}^{-2}}=0.0025\,\,s\]
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