hey, Im really confused with this problem, i have tried to solve it for a while now but i cant seem to get it, i really dont even know where to start with it. In a TV picture tube the accelerating voltage is V, and the electron beam passes through an aperture with a diameter of Delta_y and hits a screen which is a distance of x away. What is the uncertainty in position of the point where the electrons strike the screen? Use h for Planck's constant, m_e for the mass of an electron, and e for the magnitude of the charge on an electron. any help would be great.