The energy given is 2.0 keV. Since 1 eV (electron volt) is equal to \(1.602 \times 10^{-19}\) joules, we can convert keV to joules as follows:
\[ 2.0 \, \text{keV} = 2.0 \times 10^3 \, \text{eV} \]
\[ 2.0 \times 10^3 \, \text{eV} \times 1.602 \times 10^{-19} \,
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