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Find out ratio of t99 and t90 for first order

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Find out ratio of t99 and t90 for first order 

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Correct answer is: 2

\(t_{99}=\frac{2.303}{k}log\frac{100}{1}\)

\(t_{90}=\frac{2.303}{k}log\frac{100}{10}\)

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