Under the influence of light with a wavelength of L=140 nm, a photoelectron flies out from the surface of a copper ball of radius R=50 mm, having a charge Q=+1.1•10-10 C. Assuming that the electron was emitted in the radial direction, find the maximum distance at which it will move away from the surface of the ball. The work function of an electron leaving copper is A=7.2 •10-19 J.
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