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AP Physics 2
15.5 The Photoelectric Effect
IntermediateMCQConceptual18.2k
A Cartesian coordinate graph with a horizontal axis labeled f and a vertical axis labeled K_{max}. Both axes have arrows at their positive ends and intersect at the origin (0,0). No gridlines are present. Two solid straight lines with identical positive slopes rise upward and to the right. The first line intersects the horizontal axis at a point labeled f_1 and extends into the first quadrant with the label Metal 1 near its upper-right end. The second line intersects the horizontal axis further to the right at a point labeled f_2 and extends into the first quadrant parallel to the first line, with the label Metal 2 near its upper-right end. No other labels, lines, text, or axes appear.
Maximum kinetic energy versus frequency for photoelectrons from Metal 1 and Metal 2.
In a photoelectric effect experiment, monochromatic light of variable frequency illuminates two different metal cathodes, Metal 1 and Metal 2. The maximum kinetic energy of the emitted photoelectrons as a function of incident frequency is plotted for both metals, producing two parallel lines with horizontal intercepts at frequencies \(f_1\) and \(f_2\), where \(f_2 > f_1\). Which of the following claims correctly compares the two metals and explains the features of the graph?

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