1. The problem statement, all variables and given/known data Consider and electron being ejected from the surface of a heated filament at nearly zero speed. Through what potential difference must it be accelerated to achieve a speed of 8.4x10^6 m/s? 2. Relevant equations I have found that the equation I should be using is 1/2mv^2=eΔV (where I believe ΔV is m/e?) 3. The attempt at a solution No attempt finding the equation is the work I have done.