However, long before the Planck length is reached, around ~10(-25)m the energy density (mass) of the photon exceeds that required to create a Black Hole. No cosmic radiation has been seen with a wavelength smaller then 10(-19).
Despoina Evangelakou
i 'd say where the electromagnetic (EM) and the weak (W) force become one, i.e. 246 GeV. At higher energies there's no EM but EW. have a look at wiki on the unification scale or http://www.scholarpedia.org/article/Grand_unification
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