0 \times 10^{9} \mathrm{~Hz}$ using the formula $E = h \cdot v$, where $h$ is the Planck's constant ($6.626 \times 10^{-34} \mathrm{~J \cdot s}$).
Plugging in the values, we get:
$E = 6.626 \times 10^{-34} \mathrm{~J \cdot s} \times 4.0 \times 10^{9}
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