The energy of a photon is given by the equation:
\[ E = h \cdot f \]
where \( E \) is the energy, \( h \) is Planck's constant (\( 6.626 \times 10^{-34} \, \mathrm{J \cdot s} \)), and \( f \) is the frequency.
Rearrange the equation to solve for frequency:
\[ f
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