The diffusion capacitance of a P-N junction

In an intrinsic semiconductor the free electron concentration depends on

The impedance function of a parallel $$R$$, $$L$$, $$C$$ circuit has poles located at $$ - 3 \pm j4$$ rad/sec. If the value of $$L = 1H$$, determine the following:

(a) the values of $$R$$ and $$C$$
(b) the quality factor of the circuit

The value of current through the 1F capacitor of figure is.