H2 Physics · JC 2 · Hard · Energy levels and line spectra
In a photocell experiment, ultraviolet light of wavelength 250nm is incident on a metal surface of work function 2.8eV. What is the maximum kinetic energy of the emitted photoelectrons? (Take h=6.63×10−34J s, c=3.0×108m s−1, e=1.60×10−19C.)
3.5×10−19J
7.9×10−19J
4.5×10−19J
2.2×10−19J
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