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## Homework Statement

At what time (in ms) after the discharge begins is the energy stored in the capacitor reduced to half its initial value?

RC=7 ms

## Homework Equations

RC=7ms

E=.5CV^2

E=.5Q^2/C

E=.5QV

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.