Given:
Average wavelength, $\lambda = 700 nm = 700 \times 10^{-9} m$
Speed of light, $c = 3 \times 10^8 m/s$
Energy of a photon, $E = \frac{hc}{\lambda}$, where $h$ is the Planck's constant.
Plugging in the values, we get:
$E = \frac{6.626 \times 10^{-34} J \cdot
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