We can do this by multiplying the energy difference by the charge of an electron, which is $1.6 \times 10^{-19}$ J/eV. So, we have:
\[\Delta E = 0.24 \, \text{eV} \times 1.6 \times 10^{-19} \, \text{J/eV} = 3.84 \times 10^{-20} \, \text{J}\]
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