According to the classical electromagnetic theory of light, the flow of light energy continuously spreads from the source in all directions. According to this theory, how long does it take for a single atom of a tantalum cathode to accumulate enough energy to allow the emission of a photoelectron if the cathode is located 10 m from a 25 W light bulb? The work function of an electron from tantalum is 4 eV. Assume that all the energy accumulated in a tantalum atom, whose diameter is 0.3, is transferred to the photoelectron

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