A) 13 s
B) 7 s
C) 27 s
D) 4 s
Correct Answer: B
Solution :
[b] \[A={{A}_{0}}{{e}^{-0.1t}}=\frac{{{A}_{0}}}{2}\] |
\[\ln 2=0.1t\] |
\[t=10\ln 2=6.93\approx 7\sec \] |
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