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homework_4_answers - Grodin Micah Homework 4 Due Oct 4 2005...

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Grodin, Micah – Homework 4 – Due: Oct 4 2005, 11:00 pm – Inst: Sara Sutcliffe 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which scientist is associated with the oil drop experiment? 1. Thomson 2. Bohr 3. Millikan correct 4. Rutherford 5. Dalton Explanation: Millikan set up his oil drop experiment to determine the charge of an electron. 002 (part 1 of 1) 10 points Neutrons eluded discovery until the 1930’s because 1. neutrons existed in distant orbitals that were difficult to study. 2. many atoms have no neutrons. 3. neutrons have no charge and thus could not be manipulated in electric or magnetic fields. correct 4. neutrons have no mass and thus could not be quantified. Explanation: 003 (part 1 of 1) 10 points The number of fundamental particles in the 99 43 Tc atom is 1. 56 neutrons, 43 protons, and 43 electrons. correct 2. 43 neutrons, 56 protons, and 56 elec- trons. 3. 43 neutrons, 99 protons, and 99 elec- trons. 4. 55 neutrons, 43 protons, and 43 elec- trons. 5. 99 neutrons, 43 protons, and 43 elec- trons. Explanation: 004 (part 1 of 1) 10 points The isotope 131 53 I has 1. 78 neutrons. correct 2. 78 protons.
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