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Gaokao Physics Practice Question

太阳内部核反应的主要模式之一是质子一质子循坏, 循环的结果可 表示为 $4 {}^{1}_{1} \mathrm{H} \rightarrow {}^{4}_{2} \mathrm{He}+{2}^{0}_{1} \mathrm{e}+2 v$, 已知 ${}^{1}_{1} \mathrm{H}$ 和 ${ }_{2}^{4} \mathrm{He}$ 的质量分别为 $m_{\mathrm{p}}=1.0078 \mathrm{u}$ 和 $m_{a}=4.0026 \mathrm{u}$,$ 1 \mathrm{u}$ $=931 \mathrm{MeV} / c^{2}, c$ 为光速. 在 4 个 ${}^{1}_{1} \mathrm{H}$ 转变成 1 个胱 ${}^{4}_{2} \mathrm{He}$ 的过程中, 释放的能量约为

  1. A.$8 \mathrm{MeV}$
  2. B.$16 \mathrm{MeV}$
  3. C.$26 \mathrm{MeV}$
  4. D.$52 \mathrm{MeV}$

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