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Problem_Set_1 - Chemistry 341 Physical Chemistry I Fall...

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Chemistry 341 Physical Chemistry I Fall 2011 Problem Set 1 Due: Monday September 5 For this problem set and subsequent problem sets only a certain number of questions need to be submitted for grading. For this problem set submit your answers to ONLY FIVE (5) of the following 10 questions. You are still responsible for understanding the ideas for all of the problems assigned. 1. For Cr the work function, φ , is 4.40 eV. (a) Calculate the kinetic energy of electrons emitted from a chromium surface when it is irradiated with uv radiation of wavelength 200 nm. (b) What is the stopping potential, V s , for these electrons? [Ans. (a) 2.88 x 10 19 J = 1.80 eV, (b) 1.80 V] 2. When a clean surface of Ag is irradiated with light of wavelength 230 nm, the stopping potential, V s , of the ejected electrons is found to be 0.80 V. Calculate for Ag: (a) the work function, , and (b) the threshold frequency, ν o . [Ans. (a) 4.59 eV, (b) o =1.11 x 10 15 Hz] 3. In the derivation of the Planck black body formula, Planck’s principal assumption
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Problem_Set_1 - Chemistry 341 Physical Chemistry I Fall...

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