In the photoelectric effect, the work function () is the
Chapter 12, Problem 12.122(choose chapter or problem)
In the photoelectric effect, the work function () is the minimum energy a photon must have to remove an electron from a metal surface (see 7.70). For a given metal, depends on how and where the photon strikes the crystal. Copper adopts the face-centered cubic structure. If the photon strikes perpendicular to the unit cells face, is 4.59 eV; if perpendicular to a plane tangent to an edge, is 4.48 eV; and if perpendicular to a plane tangent to a corner, is 4.94 eV (1 eV ? 1.602?10?19 J). Find the wavelength (in nm) of the lowest energy photon that can remove an electron from copper, and state how it strikes the unit cell. 12.
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