115 Exam3 Sp 2005

115 Exam3 Sp 2005 - Name _ Chemistry 115 Section _ Student...

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Name _____________________________ Chemistry 115 Section ____________ EXAM III Total Points = 120 Student I.D. # ___________________ Wednesday, 6:30 PM Instructor ________________________ April 13, 2005 Directions : 1. Each student is responsible for following directions. Read this page carefully. 2. Write your name and other requested information on this page and on the separate answer sheet. 3. CODE your name on the answer sheet using an ordinary (#2) pencil. 4. CODE your correct identification number ( 9 digit Social Security ) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your section number on the answer sheet. Please use all four digits, 0101, 0102, 0201, etc. This is also very important! 6. Put all calculations on the examination pages. DO NOT PUT ANY EXTRA MARKS ON THE COMPUTER ANSWER SHEET! 7. This exam consists of 23 multiple-choice questions worth 5 points each (except #4 = 6 pts., #9 & #23 = 7 pts). Choose the one best or correct answer for each question and write it both on your exam paper and on the computer answer sheet. The computer answer sheet is the only one that will be graded! 8. This exam consists of 8 pages plus a Periodic Table. Please check to be sure that you have them all! END OF EXAM 1) Please make sure that you have entered 23 answers on your scan sheet. 2) Make sure that you have entered your name, ID number (9 digit Social Security), and lab section number (4 digits). 3) You MUST turn the scan sheet in to your TA before leaving the exam!
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Chem 115 ! Exam 3 ! 4/13/05 _A___ 1. Monochromatic light with a wavelength of 450 nm appears blue in color. Light with a wavelength of 633 nm appears: (a) Red (like a bar-code scanner) (b) Ultraviolet (makes black –light posters glow) (c) Infrared (warms French fries) (d) X-ray (exposes film inside a camera) (e) Microwave (boils water) _E___ 2. Diffraction of light occurs: (a) when light of a frequency higher than a threshold value strikes a surface to produce electron emission. (b) when a pencil appears to be bent in a glass of water. (c) when sunlight incident on falling rain produces a rainbow (d) when sunlight focused by a lens burns a hole in a piece of paper. (e) when monochromatic light waves passing through two adjacent slits can be seen from certain angles to overlap constructively (appear brighter) and other angles destructively (appear darker). _C___ 3. In the photoelectric effect, we know the frequency of light incident on a metal surface must be higher than a certain threshold value. As it happens, the value is different for every metal. Why do you suppose this is the case?
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115 Exam3 Sp 2005 - Name _ Chemistry 115 Section _ Student...

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