Question: 0 1 2 1 2 0 0.5 1 0 1 0 0.5 1 -2 -1 0 Representation: Physics Concept(s): 0 Initial Equation(s): Symbolic Answer:

0 1 2 1 2 0 0.5 1 0 1 0 0.5

0 1 2 1 2 0 0.5 1 0 1 0 0.5 1 -2 -1 0 Representation: Physics Concept(s): 0 Initial Equation(s): Symbolic Answer: Units Check: Neatness: Total: A source of monochromatic (i.e., single-wavelength) EM radi- ation strikes a sheet of gold with work function W = 5.1 eV. The stopping voltage required to bring all the ejected elec- trons to a halt is measured to be Vi 3.5 V. If this same source of EM radiation were to strike a sheet of potassium with work function W = 2.3 eV, what stopping voltage would be required? As part of the representation, draw a graph with the EM radiation's frequency on the x-axis and the stopping voltage on the y-axis; draw separate curves for the gold sheet Correct Answer: and the potassium sheet. Y N

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