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83. (a) We assume the electron starts from rest. The classical formula for kinetic energy is
Eq. 37-51, so if
v = c
then this (for an electron) would be
2
11
22
(511 ke V)
mc
==
255.5 ke V
(using Table 37-3). Setting this equal to the potential energy loss (which is
responsible for its acceleration), we find (using Eq. 25-7)
255.5 keV
255 keV
255.5 kV
256 kV.

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