When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the photon's energy is required to free the electron from the surface. The remaining energy becomes the kinetic energy of the photoelectron. The minimum energy for the emission of an electron from the surface of a particular metal is 2.78E-19 Joules. What is the kinetic energy of electrons emitted from the surface of the metal when it is irradiated by electromagnetic radiation of wavelength 115 nanometers? Enter your answer in scientific notation in units of J (joules).
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