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Unformatted text preview: howard (cah3459) homework 01 Turner (56705) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire? 1. To count the vehicles 2. To transfer electrons to the automobile 3. To warn the drivers 4. To discharge the automobile correct 5. To transfer positive particles to the auto- mobile Explanation: Metal wire can conduct net charges to the ground so that the car will discharge. 002 10.0 points The five thousand billion freely moving elec- trons in a penny repel one another. Why dont they fly off the penny? 1. The electrons attract each other. 2. They dont have enough speed. 3. The shell of the penny prevents the elec- trons from flying. 4. They are attracted to the five thou- sand billion positively charged protons in the atomic nuclei of atoms in the penny. correct 5. They cause a jam when they try to fly away. Explanation: The electrons are bound to the nuclei. 003 10.0 points How can a charged atom (an ion) attract a neutral atom? 1. The charged atom can hit the neutral atom and make it positively charged or nega- tively charged. 2. The charged atom can produce secondary electrons to interact with the neutral atom and make it positively charged or negatively charged. 3. The charged atom can emit x rays to induce ionization of the neutral atom. 4. An ion polarizes a nearby neutral atom, so that the part of the atom nearer to the ion acquires a charge opposite to the charge of the ion, and the part of the atom farther from the ion acquires a charge of the same sign as the ion. correct Explanation: An ion polarizes a nearby neutral atom, so that the part of the atom nearer to the ion acquires a charge opposite to the charge of the ion, and the part of the atom farther from the ion acquires a charge of the same sign as...
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This note was uploaded on 09/15/2010 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas at Austin.
- Fall '08