The electrons in a cathode ray tube are emitted by a hot
filament cathode and are accelerated by an electric field applied
between the cathode and two orthogonal pairs of parallel plate
electrodes. The beam passes through the gap between the electrodes
and can be deflected up and down, or left and right if the parallel
plates are appropriately biased. As the electrons pass through the
electrodes, their kinetic energy increases. Assume the electrons
are emitted from the cathode with...