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The frequency of a photon is related to its energy by

E = hf

where E is the energy, h is Planck's constant (6.626 x 10-34 Js), and f is the frequency.

Solving for the frequency

f = E/h

f = (1.369 x 10-24 J)/(6.626 x 10-34 Js) = 2.066 x 109 s-1

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