At what time (in ms) after the discharge begins is the energy stored in the capacitor reduced to half its initial value?
Q_f = Q_i * e^(-t/RC)
The Attempt at a Solution
I don't even know where to go from here. I know that since the problem involves RC, the equation to solve the problem must have some form of Q_f = Q_i * e^(-t/RC) but I'm stuck.