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Unformatted text preview: Ph 291, Fall 2009 Final Exam Name: (no name, no score!) Multiple Choice Answer Sheet # Answer 1 2 3 4 5 Subtotal /75 1 Ph 291, Fall 2009 Final Exam Name: (no name, no score!) 1. [15 pts] Suppose that an object positioned 10 inches to the left of a positive (converging) lens is imaged 30 inches to the right of the lens. Where will the image appear if the object is now moved so that it is 5 inches from the lens? (A) +6 inches (B)- 6 inches (C) +10 inches (D)- 10 inches (E) +15 inches (F)- 15 inches 2. [15 pts] The nervous system transmits information from cell to cell using stereotypical electrical pulses. The energy for these discharges is stored in the form of electric charges held on opposite sides of a semi-permeable membrane. An ionic species with a di ff erence in concentration between the inside and the outside of the cell leads to the establishment of an electric potential di ff erence given by: V = RT F log X Y where R , T and F are constants, log log e and X and Y are the external and internal concentrations, re- spectively. Suppose that you have made measurements of X and Y along with their associated experimental uncertainties X and Y and you use these to predict the expected membrane potential. The uncertainty inand you use these to predict the expected membrane potential....
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- Spring '08