A Beryllium-8 Nucleus at Rest Undergoes Double Alpha Decay as Follows

question 132

Multiple Choice

A beryllium-8 nucleus at rest undergoes double alpha decay as follows: $\begin{array} { l } 8 \\4\end{array}$ Be ? $\begin{array} { l } 4 \\2\end{array}$ He + $\begin{array} { l } 4 \\2\end{array}$ He The known atomic masses are: $\begin{array} { l } 4 \\2\end{array}$ He: 4.002603 u $\begin{array} { l } 8 \\4\end{array}$ Be: 8.005305 u
What is the kinetic energy of each departing alpha particle? (1 u = 931.5 MeV/c²)

• A)46 keV
• B)65 keV
• C)92 keV
• D)130 keV
• E)180 keV

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