H2 Physics · JC 2 · Hard · Energy levels and line spectra
A metal has work function ϕ=2.0eV. What is its threshold wavelength for the photoelectric effect? (Take h=6.63×10−34J s, c=3.00×108m s−1, e=1.60×10−19C.)
6.2×10−7m
3.1×10−7m
9.9×10−7m
2.0×10−7m
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