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Unformatted text preview: Ph 291, Fall 2008 Final Exam Name: (no name, no score!) Multiple Choice Answer Sheet # Answer 1 2 3 4 5 Subtotal /75 1 Ph 291, Fall 2008 Final Exam Name: (no name, no score!) 1. [15 pts] The figure shows three pairs of polariz- ing sheets seen face-on. The polarizing direction of each sheet is indicated by the dashed line. In each case, unpolarized light is initially incident on the 1 st polarizer (top row) and the light output from this po- larizer is subsequently sent through the 2 nd polar- izer (bottom row). In increasing order, rank the cases according to the fraction of the initial in- tensity which exits the system. (A) 1, 2, 3 (B) 1, 3, 2 (C) 2, 1, 3 (D) 2, 3, 1 (E) 3, 1, 2 (F) 3, 2, 1 2. [15 pts] If a pulse of electrical current is injected into a coaxial cable, it will travel down the cable much like a pulse on a string. The amplitude of the pulse decays by a factor of 1 /e within a distance . This distance is called the space constant of the cable and is given by the formula = a s R m R L where R m and R L are the transverse and longitudinal resistances of the cable, respectively, and a is the diameter of the cable. Suppose that you have made measurements of these quantities along with their associated experimental uncertainties R m , R L and a and you use these to compute the space constant....
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- Spring '08