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Energy / eV Chem 155 <strong>Final</strong> review topics and questions: 22. Light of variable wavelength is incident on a piece of metal in vacuum, the metal is held at zero volts. Electrons emitted from the metal are collected and analyzed as a function of energy. Draw a diagram of the photoelectron energy versus the irradiating light frequency. Identify the x-intercept and the slope of the curve and indicate the significance of both. See notes on photoelectric effect: x-intercept is the work function of the metal – the energy required to take an electron out of the conduction band and into vacuum. The slope of the line is Plank’s constant. 23. A small hypothetical molecule has the following energy level diagram. Indicate, using arrows, the transitions corresponding to infrared light absorption, visible light absorption, and visible light fluorescence. Be prepared to sketch the absorbance or fluorescence spectra as well. 3 2 1 Vis abs. Vis fluor. Vis abs. Vis fluor. 0 IR abs. 400 500 600 Wavelength / nm increasing
Path of analyte through plasma or flame Chem 155 <strong>Final</strong> review topics and questions: ================================================================ Part II Practice problems: ================================================================ 1. Fill in the empty boxes consistent with the diagram. SEE NOTES In boxes 1 to 6 inddicate in what form the analyte is likely to exist: 6 In boxes 7 and 8 below put the equation that relates concentration and light power corresponding to emission (7) and absorption (8): 5 Emission 7 HCL h 4 Absorption 8 3 2 1 Nebulize Liquds Solids Gases
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Final Prep Answers

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