2006_finalm3 - Physics 214 Final Exam (May 16 from...

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1 Physics 214 Final Exam (May 16 from 2:00-4:30 ) Name: _______________________________________ Signature: _______________________________________ Section # and TA: ________________________________ Total number of pages: 12 Score: I II III IV Result This examination is closed books and closed notes . NO calculators are permitted . A formulae sheet is provided. Use the provided space after each question for your answers. The first part consists of a few simple questions, and no partial credit will be given. Parts II, III, IV are problems for which you have to show the work done arriving at the answer. Partial credit will be given for these answers. The perfect score of the exam is 100. The point value of the problem is given in the parenthesis next to the problem. Please put your name on each page. By signing this exam you certify to adhere to the Cornell academic integrity code.
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2 Part I: Multiple choice questions (44 points – 5 points each for problems b), c), f) and g), 6 points each for problems a), d), e) and h)) You do not need to show work. No partial credit. a) Light with a certain wavelength is passed through three different slit configurations. In each configuration, the slits have equal width a and are separated at equal distance d. However, the 3 different configurations may have differing numbers of slits with different values of a and d. The following 3 interference-diffraction patterns are observed. Diffraction pattern -60 -40 -20 0 20 40 60 angle in degrees Diffraction pattern -60 -40 -20 0 20 40 60 angle in degrees Diffraction pattern -60 -40 -20 0 20 40 60 angle in degrees Which pattern corresponds to the greatest number of slits ? _____________ Which pattern corresponds to the greatest slit separation, d ? ____________ Which pattern corresponds to the greatest slit width, a ? _____________ A B C
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3 b) Consider a 4-narrow-slit setup. The center of the pattern on the screen has a maximum intensity of 16I 0 . Let us now focus our attention on the point closest to that central maximum that has zero intensity. Suppose you now cover the top slit. The intensity at that point now is (A) I=0, that is no change (B) I=I 0 (C) I=2I 0 (D) I=4I 0 c) Consider the double narrow slit setup. Suppose one slit is twice as wide as the other so that the narrower slit alone allows light with intensity I 0 to reach the screen. In the region not far from the center, we find that the maximum
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2006_finalm3 - Physics 214 Final Exam (May 16 from...

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