41. (a) The work-kinetic energy theorem applies as well to relativistic physics as to Newtonian; the only difference is the specific formula for kinetic energy. Thus, we use W = ∆Kwhere K = mec2(γ– 1) (Eq. 37-52), and mec2= 511 keV = 0.511 MeV (Table 37-3). Noting that ∆K = mec2(f– i), we obtain ()222221111511keV10.1910.180.996 keV1.0 keV.efiWKmcββ⎛⎞⎛⎞=∆ =−=
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