Electrons go through a single slit 150 nm wide and strike a screen 24.0cm away. You find that at angles of ±20.0o from the center of the diffraction pattern, no electrons hit the screen hut electrons bit at all points closer to the center.
(a) How fast were these electrons moving when they went through the slit?
(b) What will be the next larger angles at which no electrons hit the screen?