Two billiard balls each with a mass of .35 kg strike each other head on one ball is additionally moving to the left at 4.1 m/s and ends up moving right at 3.5 m/s the second ball is initially moving to the right at 3.5 m/s find the velocity of the second ball

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