1. According to the "Solar model" of a single ionized Helium atom has one electron revolving in a circular orbit around a stationary nucleus made of two protons and two newtrons. The diameter of this atom is .95*10^-10m. Use Coulomb's law and calculate the speed of the electron (m/s) in its orbit. 2. Relevant equations Fe=K*q1*q2/d2 where k=8.99*10^9 Nm^2/s^2. v=d/t 3. The attempt at a solution. How do I go about solving this question when either of distance or time is given? Any help is appreciated.