To discharge a capacitor of 1mF charged with a voltage of 1 volt we connect it, at time t=0, with a resistor of R?. When we measure the voltage in the resistor we find it to be v_R (t)=e^(-t) u(t). Determine the resistance R. If the capacitor has a capacitance of 1µF, what would be R? In general, how are R and C related?