Solution to task 575 from Chertov's for extramural stud

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• At a distance r = 5 m from a point monochromatic (λ = 0.5 µm) isotropic source, there is an area (S = 8 mm2) perpendicular to the incident beams. Determine the number N of photons incident on the site every second. Radiation power P = 100 W.