Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for longer wavelengths of light. The work function of the surface is
A) 5.0 eV.
B) 0.60 eV.
C) 2.5 eV.
D) 4.0 eV.
E) 0.40 eV.
C
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