A 0100-ma electron beam by kinetic energy 540 ev enters a, Physics

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A 0100-ma electron beam by kinetic energy 540 ev enters a

A 0.100-mA electron beam by kinetic energy 54.0 eV enters a sharply defined region of lower potential where the kinetic energy of the electrons is increased with 10.0 eV. What current is reflected at the boundary? (This simulates electron scattering at normal incidence from a metal surface, as in the Davisson-Germerexperiment.)

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