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Unformatted text preview: E2= 6.0 eV .................................. c) What is the energy of the lowest frequency photon that this excited electron can emit? t """" "-~-t 2:::0 lO-(, =: ~ 4. (2 pts) Why can intense red light not cause electrons to be emitted from a metal surface but weak ultraviolet light can? It t2Q~~'\j ~ ~ ~~ld ~~ atJ M-e ~ ~ ~8/-.-p~h-/ ~~-h> ~Jecl-CL1 p~f-o~ lQ~ '\k ~~fJf/bJ(N}; ~ c~ P~). A~~l.u VlV p~b ~ lol7) tA4J ~ 5. (2 pts) An isoto e of Astatine ( 88sAt)decays first by alpha decay, then beta decay. What is the final sotope (Some possibly important information about the atomic numbers of some elements: 81 I, 82Pb , 83Bi,S4f1>,8sAt, 86Rri, 87Fr, 88Ra.) . ~ ~ 2 \ '6 A Lf 2''t 0_ '":'>. . 1... :\:-? <X-( . 'is \ ~ e-t Y .-f I)()'ro~ <6"') 2-\ l)3. .-I a ~ ~ ,...
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This note was uploaded on 02/10/2011 for the course PHYS 14 taught by Professor Physcs14 during the Spring '09 term at Santa Monica.
- Spring '09