Radios often utilize a variable capacitor in series with an inductor to tune the circuit to a particular frequency. In a particular shortwave radio, the value of the inductor is L $=1\mathrm{.}02$H$.$ What must be the capacitance $($in pF$)$ of the circuit so that the radio is tuned to a frequency of f $=6\mathrm{.}78$ MHz$?$