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14.17. Show that the differential cross section for the photoelectric effect in which an electron in the ground state of hydrogen is ejected when the atom absorbs a photon is given by do h k, (e . k( )2 = 32a mew [(1/ag) + 9214 where q = k; - ky. Assume the ejected electron is sufficiently energetic that the wave function for the electron can be taken to be the plane wave gik for (r|k() = where py = hik is the momentum of the electron and hik, is the momentum of the incident photon. Suggestion: The cross section is the transition rate divided by the incident photon flux, which is equal to c/ V in the box normalization used in this chapter