Photons of energy 3.5 eV fall on a metal of work function 2.0 eV. What is the maximum kinetic energy of the emitted electrons?
Correct answer B. 1.5 eV
Explanation
By Einstein's photoelectric equation, the photon energy minus the work function gives the maximum kinetic energy: K.E.max = hf − φ = 3.5 − 2.0 = 1.5 eV.
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