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Unformatted text preview: 3. Plancks Constant If you look at the values you would use to calculate the slope of the line, youll 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 Plancks 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 y-intercept. 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 y-intercept (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