28. (a) The rest energy of an electron is given by E = mec2. Thus the momentum of the photon in question is given by 231822(9.11 10kg)(2.998 10 m/s) 2.73 10kg m/s0.511 MeV / .eemcEpmcccc−−=== =××= ×⋅=(b) From Eq. 38-7,
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