In real life, collisions are neither purely elastic nor inelastic, but instead, fall somewhere between. however, you can still classify many collisions as primarily elastic or inelastic. for example, hitting a baseball is a great example of an elastic collision, whereas catching the baseball is a great example of an inelastic collision. 1. explain why hitting and catching a baseball are great examples of each type of collision. 2. describe another real-world example of a perfectly elastic collision. 3. describe another real-world example of a perfectly inelastic collision.

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves