Physics 112 - 6 - Physics 2 - Conceptual Physics, 10th ed.,...

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Physics 2 - Conceptual Physics , 10th ed., by Paul Hewitt (San Francisco, CA: Addison-Wesley, 2009). Written Assignment 6 Answer all of the following questions. Do not send in a partially completed assignment. Answer each question as completely as possible, but do not merely copy answers from your reading materials. If you cite a reference in the text, explain the meaning of the citation. 1. Define the following terms: a. Radioactive half-life: (Hewitt pp641) A period of time in which half the nuclei of a species of radioactive substance would decay. In other words, the time it would take half the original amount of radioactive isotopes to decay. 1 In other words, radioactive half-life of a substance is the time period during which the number of nuclei decreases to its half. If we take any given radio isotope, after it’s half life is complete, the remainder will have the same half life leaving a quarter, again the same half life remaining an eighth. The books example is Radium 226 1620 years - half the specimen will have decayed, over the following 1620 years another half of that specimen will have decayed, with a remaining fourth of the isotopes still active. b. Correspondence principle: (Hewitt pp631) Correspondence principle states that the behavior of systems described by the theory of quantum mechanics must be able to produce the old classical physics laws. The new theory must give the same results as the old theory, they must correspond if the old theory has been proven valid. Example:
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This note was uploaded on 09/29/2010 for the course PHYSICS PHY 112 taught by Professor Sohn during the Summer '10 term at Thomas Edison State.

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Physics 112 - 6 - Physics 2 - Conceptual Physics, 10th ed.,...

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