Work Function Values Are Often Given in Electron Volts (1

question 102

Multiple Choice

Work function values are often given in electron volts (1 eV = 1.602 * 10^-19 J) .You create an oxide material that has a work function of 6.10 eV.How many electrons would be emitted from the material per second when it is irradiated by the 172 nm light of a 55.0 W xenon excimer lamp, and what is their kinetic energy? Assume all of the incident photons cause electron emission.

• A)none; 172 nm is not energetic enough
• B)8.70 * 10¹⁷ electrons; 8.70 * 10^-19 J
• C)4.78 *10¹⁹ electrons; 1.73 -10^-19 J
• D)5.5 *10¹⁷ electrons; 5.40 *10^-17 J
• E)1.86*10¹⁶ electrons; 5.37 *10^-17 J

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