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AP Physics 2
15.5 The Photoelectric Effect
AdvancedMCQGraphicalMathematicalConceptual16.3k
A two-dimensional Cartesian graph plotting stopping potential V_s on the vertical axis against light frequency f on the horizontal axis. The vertical axis is labeled V_s \text{ (V)} and the horizontal axis is labeled f \text{ (Hz)}. Two straight, parallel lines with positive slopes are drawn. The left line is labeled Metal 1, intersecting the horizontal axis at a lower frequency f_{0,1} and extending upward and to the right. The right line is labeled Metal 2, intersecting the horizontal axis at a higher frequency f_{0,2} and extending upward and to the right parallel to Metal 1. Dashed vertical lines drop from the horizontal intercepts to labeled points f_{0,1} and f_{0,2} on the f-axis. Both lines have the same slope. No other labels, lines, text, or axes appear.
Stopping potential vs. frequency for two different metals.
An experiment is conducted to investigate the photoelectric effect using two different metallic cathodes, Metal 1 and Metal 2. The stopping potential \(V_s\) required to reduce the photocurrent to zero is measured as a function of the frequency \(f\) of the incident light, resulting in the two parallel lines shown in the graph. Which of the following claims correctly identifies the slope of these lines and provides the correct physical justification for why the slope is identical for both metals?

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