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5 Solved Questions on Instrumental Methods Analysis - Exam 1 | CHEM 421, Exams of Chemistry

Indiana State University (ISU)Chemistry
Prof. Stephen Wolf

Material Type: Exam; Professor: Wolf; Class: Instr Methods Analysis; Subject: Chemistry; University: Indiana State University; Term: Spring 2009;

Typology: Exams

Pre 2010

Uploaded on 07/22/2009

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Chem 421: Exam 1 Spring 2009. EXAM 1 Instrumental Methods of Analysis Chem 421 February 16, 2009 Name: SHOW ALL PERTINENT WORK FOR CREDIT. REPORT RESULTS WITH CORRECT UNITS AND SIGNIFICANT DIGITS ta. {8 pts.) A photocathode in a phototube has a 3.60-eV work function. What wavelength of light is required to eject an electron from the photocathode? 2 (3.60 eV \LGO 104 V) = SFe*to"U ee he yeas he 2 (v.W2b«10%* Js\(3, 000 10? ~/s) . ees A S-FeHlOry 2 3.45 «107% Answer: < O45 nm tb. (12 pts.) The same photocathode is exposed to a different light source. The photocathode emits electrons with a velocity of 4.40x10° m/s. What is the frequency of this light source?” KEe = dave = 4 &107«107 ks\(4- 40 ioe may = $.818S