摘要：15．解:①4H →He +2e ②Δm = 4mP- ma-2me = 4×1.0073u-4.0015u-2×0.0005u = 0.0267 u ΔE = Δ mc2 = 0.0267 u×931.5MeV/u ＝24.86 MeV

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