Imagine an electron (mass m = 9.1 × 10^-31 kg) revolving around the nucleus of a helium atom, held in orbit by the electric force between them. At a distance of 0.5 × 10^-10 m, this electron experiences an electric force of 1.84 × 10^-7 N. Determine the number of revolutions per second that this electron makes around the nucleus.