10. In a common type of mass spectrometer, a beam of ions is passed through a velocity sector with crossed electric and magnetic fields. What is the purpose of the velocity sector?
O to block all ions except those with specific speeds
to decrease the kinetic energy of the ions
O to prevent the ions from traveling in a circular path
O to strip loose electrons from the ions

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states