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ch1_2011 - Physics 228 Exam 1 24 Feb 2011 Profs Rabe and...

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Physics 228 - Exam 1 24 Feb 2011 Profs. Rabe and Coleman = Your name sticker with exam code = SIGNATURE Turn o ff and put away cell phones now! 1. The exam will last from 9:40pm to 11:00pm. 2. Use a #2 pencil to make entries on the answer sheet. Enter the following ID information now, before the exam starts. 3. In the section labelled NAME (Last, First, M.I.) enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial. 4. Under STUDENT # enter your 9-digit student ID. 5. Enter 228 under COURSE, and your section number (see label above) under SEC. 6. Under CODE enter the exam code given above. 7. During the exam, you may use pencils, a calculator, and one handwritten 8.5 x 11 inch sheet with formulas and notes, with- out attachments. 8. There are 16 multiple-choice questions on the exam. For each question, mark only one answer on the answer sheet. There is no deduction of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. At the ened of the exam, hand in the answer sheet and the cover page. Retain this question paper for future reference and study. 9. When you are asked to open the exam, make sure that your copy contains all 16 questions. Raise your hand if this is not the case, and a proctor will help you. Also raise your hand during the exam if you have a question. 10. Please SIGN the cover sheet under your name sticker and have your student ID ready to show to the proctor during the exam. Useful information c = speed of light = 3.00 × 10 8 m/s 1 nm = 10 - 9 m 1 μ m = 10 - 6 m n W =refractive index of water =1.33 1
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1. Di ff racted light of wavelength λ produces the intensity pattern shown below . To what situation does the intensity pattern shown correspond to? a) Single slit di ff raction, where the slit width d is about the same as λ b) Interference from mul- tiple, equally spaced, slits. c) Double slit interference, where the slit width is much less than λ . d) Single slit di ff raction, where the slit width d is much less than λ . e) Double slit interference, where the slit width is about the same as λ . 2. X-rays of wavelength 0.2 ˚ A are di ff racted o ff a cubic crystal with inter-atomic spacing a = 1 ˚ A. One of the X-ray di ff raction spots occurs when the beam makes an angle of 13 degrees to the planes.
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