(b) At low speeds, the pre-Einsteinian expressions p = mvand Kmv=122apply. We note that pcK>>at low speeds since cvin this regime. Thus, mmvcmvmv cmvcmv cm→−≈=bgchchbgch212221222212.(c) Here, pc= 121 MeV, so mc=−=1215525510562bg..MeV / c2Now, the mass of the electron (see Table 37-3) is me= 0.511 MeV/c2, so our result is roughly 207 times bigger than an electron mass, i.e.,
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