\(m = \frac{E}{{{c^2}}} = \frac{{1MeV}}{{{c^2}}} = \frac{{{{10}^6}eV}}{{{c^2}}} = \frac{{{{10}^6}.1,{{6.10}^{ - 19}}}}{{{{({{3.10}^8})}^2}}} = 1,{78.10^{ - 30}}kg\)
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