What is the frequency of a photon with an energy of 4.56 x 10-19J?

The frequency of a photon can be calculated using the formula E = hf, where E is the energy of the photon, h is the Planck's constant (6.626 x 10^-34 J s), and f is the frequency. Rearranging the formula to solve for frequency, we get f = E / h. Plugging in the values, f = (4.56 x 10^-19 J) / (6.626 x 10^-34 J s) ≈ 6.88 x 10^14 Hz.