Given:
Planck's constant, \( h = 6.63 \times 10^{-34} \, \text{J s} \)
Speed of light, \( c = 3 \times 10^8 \, \text{m/s} \)
Wavelength, \( \lambda = 660 \times 10^{-9} \, \text{m} \)
Using the formula for energy of a photon:
\[ E = \frac{hc}{\lambda} \]
\[ E =
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