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Unformatted text preview: 3. Planck’s Constant If you look at the values you would use to calculate the slope of the line, you’ll notice that the “rise over run” would energy over frequency. Look at the formula E = hf and solve for energy over frequency… what do you get? So the slope of the graph will always be Planck’s constant. Look at the graphs on page 776 of the textbook to see examples of these points. The slope is always the same, but every material has a unique x and yintercept. If you know any two of the three values you would be able to draw a graph for the material. You can even relate the photoelectric effect formula to the formula for a straight line graph if it helps you remember the three points from above… hf = E k + W E k = h f – W y = m x + b The yintercept (W) will always be negative, as it takes energy added to the material to overcome the bond it has with its surface electrons....
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 Fall '08
 RABE
 Physics, Electron, Photon, line graph, threshold frequency

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