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28. (a) The rest energy of an electron is given by
E = m
e
c
2
. Thus the momentum of the
photon in question is given by
2
31
8
22
(9.11 10
kg)(2.998 10 m/s) 2.73 10
kg m/s
0.511 MeV / .
e
e
mc
E
pm
c
cc
c
−−
==
= =
×
×
= ×
⋅
=
(b) From Eq. 387,
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 Spring '08
 Any
 Physics, Energy, Momentum, Photon

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