### Possible Answer

The metric (International) system defines a hertz (Hz) as a unit of frequency, while a joule (J) represents a unit of energy. The conversion between these units is based on the Planck's equation written as: Energy = Planck Constant x Frequency. - read more

Best Answer: You can't, in general. IF you're talking about photon energies, then the relationship E = h nu applies. E is the photon energy (which will be a very small number of Joules), nu is the frequency (Hertz), and h is Planck's Constant which, as I recall, is about 6.63 x 10^-34 ... - read more

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