On Picture 1 is shown the electromagnetic (EM) spectrum. The wavelengths are represented in meters, the frequencies in hertzs. Also, on the picture is represented the energy of one photon for different frequencies of the EM waves in electron volts (eV). As we can see from the axis, the energy per photon increases as the frequency of the EM wave increases too (or the wavelength of the EM wave decreases).
The energy of one electron volt expressed in joule: 1 eV = 1.60217646 × 10^-19 J.
Picture 1: The Electromagnetic Spectrum (Source: Lawrence Berkeley National Laboratory)
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