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45. The initial wavelength of the photon is (using the result of problem 3)
λ
=
hc
E
=
1240 eV
·
nm
17500 eV
=0
.
07086 nm
or 70
.
86 pm. The maximum Compton shift occurs for
φ
=180
◦
, in which case Eq. 3911 (applied to an
electron) yields
∆
λ
=
µ
hc
m
e
c
2
¶
(1
−
cos 180
◦
)=
µ
1240 eV
·
nm
511
×
10
3
eV
¶
(1
−
(
−
1)) = 0
.
00485 nm
where Table 383 is used. Therefore, the new photon wavelength is
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 Fall '08
 SPRUNGER
 Physics, Photon

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