Spectroscopy KEY (v.3) - Second Exam Chem 241 Professor...

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1 Second Exam October 13, 2010 Name: __________KEY-3 ___________ Chem 241 Professor Jorgenson (please print full name) Honor Code Pledge: _____________________________ ( s i g n a t u r e ) c = 3.00 x 10 8 meters/second h = 6.63 x 10 -34 joule-seconds N= 6.022 x 10 23 mole -1 = c/n E = h A = bC A = - Log (T) = 2 - Log (%T) 25.0 x10 -20 5.0 x10 -20 10.0 x10 -20 15.0 x10 -20 20.0 x10 -20 0x10 -20 E n e r g y ( J o u l s ) S 0 S 1 T 1 1 2 3 9 5 4 6 Molecular Energy Level Diagram (energies listed for a single molecule) 8 10 7
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2 Name: __________________________________ ( please print full name) Answer Page: Using BLOCK CAPITAL LETTERS write the letter of your answer to each problem in the space provided below 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____ 11. _____ 12. _____ 13. _____ 14. _____ 15. _____ 16. _____ 17. _____ 18. _____ 19. _____ 20. _____ 1) Referring to the energy level diagram on the front page of the exam, which process (or processes) corresponds to internal conversion? A) 7 B) 3 and 4 C) 2, 5, 6 and 8 D) 3 E) 3, 4 and 7 F) 4 G) 1 H) 1, 4 and 10 2) Referring to the energy level diagram on the front page of the exam, which process (or processes) corresponds to vibrational relaxation? A) 7 B) 3 and 9 C) 10 D) 2, 6 and 9 E) 4 F) 1 G) 1, 4 and 10 H) 2, 6, 9 and 10 3) Referring to the energy level diagram on the front page of the exam, which process (or processes) corresponds to fluorescence? A) 3, 7 and 9 B) 5 C) 3 and 9 D) 2, 5, 6 and 8 E) 8 F) 1 G) 1, 4 and 10 H) 5 and 8 4) Referring to the energy level diagram on the front page of the exam, calculate the frequency of light emitted when this molecule emits phosphorescence. A) 1.5 x 10 14 sec -1 B) 3.0 x 10 14 sec -1 C) 1.2 x 10 15 sec -1 D) 6.0 x 10 14 sec -1 E) 2.0 x 10 14 sec -1 F) 7.0 x 10 14 sec -1 G) 4.5 x 10 14 sec -1 H) 8.0 x 10 13 sec -1 5) Referring to the energy level diagram on the front page of the exam, calculate the wavelength of light this molecule emits by fluorescence. Express your answer in units of nanometers. A) 2.6 x 10 2 nm B) 5.0 x 10 6 nm C) 1.3 x 10 3 nm D) 4.4 x 10 2 nm E) 1.5 x 10 15 nm F) 1.1 x 10 15 nm G) 5.3 x 10 2 nm H) 3.3 x 10 2 nm
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3 6) Referring to the energy level diagram on the front page of the exam: when this molecule absorbs light and emits fluorescence, how much of the absorbed light energy is ultimately converted into heat in the surroundings? Express your answer in units of Joules. A) 1.5 x 10
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This note was uploaded on 08/27/2011 for the course CHEM 101 taught by Professor Smith during the Spring '11 term at East Carolina University .

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Spectroscopy KEY (v.3) - Second Exam Chem 241 Professor...

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