Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

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

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

koofers-user-yxk-1
koofers-user-yxk-1 🇺🇸

10 documents

1 / 8

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
pf3
pf4
pf5
pf8

Partial preview of the text

Download 5 Solved Questions on Instrumental Methods Analysis - Exam 1 | CHEM 421 and more Exams Chemistry in PDF only on Docsity!

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