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Unformatted text preview: Physics 7B Quiz 3 Grade: Name: _______________________ ID: _______________________ DL Section: I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit! 1. (2.5 pts) Calcium ions diffuse through a permeable membrane separating a high concentration solution with 3000 parts per million (ppm) to a low concentration solution near zero ppm. Assume the ion flow rate is I (which has units of ions per second) If we measure the ion transport rate with a membrane of twice the thickness, but from a solution with 3000 ppm on one side and 2000 ppm on the other, what will the new ion flow rate be? Explain your reasoning in a clear sentence or two, using the ideas of linear transport. (Not just math!) 2. (2.0 pts) On a hot day it is 100 degrees out, but at night it cools down to 80 degrees. If your home air conditioning maintains an inside temperature of 70 degrees, then what fraction of your energy bill is...
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- Spring '10