A beam of monochromatic light has photons with energy 3.3eV and is directed onto three different clean metal surfaces X, Y, and Z with work functions ϕX=4.5eV, ϕY=2.8eV, and ϕZ=3.1eV. Rank the magnitudes of the maximum kinetic energies of any emitted electrons from greatest to least.
a) Z > Y > X
b) Y > Z > X
c) X > Y = Z
d) X > Z > Y