Before the discovery of the neutron by james chadwick in 1932, it was thought that the nucleus contained electrons and neutrons. use the uncertainty principle to show that an electron cannot exist inside the nucleus. (compare the attractive coulomb potential to the energy uncertainty resulting from the confinement within the nucleus. take the radius of the nucleus to be 10-15 m.)

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)