Photoelectric Effect Part 2.notebook 1 May 09, 2013 May 97:36 AM http://mutuslab.cs.uwindsor.ca/schurko/molspec/animations/shockwave_animations/peeffect5.swf May 98:06 AM
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Photoelectric Effect Part 2.notebook
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May 09, 2013
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http://mutuslab.cs.uwindsor.ca/schurko/molspec/animations/shockwave_animations/peeffect5.swf
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• ‐ the greater the intensity/brightness, the greater the photoelectric current
• Because . . . . One photon emits one electron
• Dim light – 3 photons hit metal and emit 3 electrons• Bright light – 5 photons hit metal and emit 5
electrons so . . . there is a greater photoelectric current
Intensity Matters
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• Frequency of EMR affects the energy of the electronsThe greater the frequency of the EMR above the threshold frequency of the metal, the greater the energy of the photoelectrons
Frequency Matters
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• Lines are all parallel, with equal slopes:
• Slopes = Planck’s constant
• X‐intercept = threshold frequency of metal
• Y‐intercept = work funcon of metal
Graphical Analysis: Energy vs Frequency
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Summary:
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Assignment: Workbook p. 261 #7 17, 27, 32a,b
Read handout of photoelectric effect applications.
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