A beam of monochromatic light has photons with energy and is directed onto three…

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A beam of monochromatic light has photons with energy

3.3\,\text{eV}

and is directed onto three different clean metal surfaces X, Y, and Z with work functions

\phi_X=4.5\,\text{eV}

\phi_Y=2.8\,\text{eV}

, and

\phi_Z=3.1\,\text{eV}

. Rank the magnitudes of the maximum kinetic energies of any emitted electrons from greatest to least. (a) Z

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X (b) Y

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X (c) X

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Z (d) X

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