Answers: 2
![Q=Q_{max}[1-e^{-\frac{t}{RC}}]](/tpl/images/0703/8648/01e59.png)
(1)![Q=\frac{2}{3}Q_{max}=Q_{max}[1-e^{-\frac{t}{RC}}]\\\\\frac{2}{3}=1-e^{-\frac{t}{RC}}\\\\e^{-\frac{t}{RC}}=\frac{1}{3}\\\\-\frac{t}{RC}=ln(\frac{1}{3})\\\\t=-RCln(\frac{1}{3})=1.098RC](/tpl/images/0703/8648/12d3c.png)
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