To calculate the frequency and wavelength of a photon with an energy of 6.2 x 10^4 eV, use Planck's equation E=hf, where E is energy, h is Planck's constant, and f is frequency. After determining the frequency, the wavelength can be calculated using the equation E = (h)(c) / λ or by applying the wave equation c = fλ. It's important to ensure that units are consistent throughout the calculations. This approach allows for a straightforward determination of both frequency and wavelength. Understanding these relationships is crucial in photon energy calculations.