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# Suppose one food irradiation plant uses a 137 Cs source while another uses an equal

ISBN: 9781938168932 372

## Solution for problem 13 Chapter 32

College Physics for AP® Courses | 1st Edition

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College Physics for AP® Courses | 1st Edition

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Problem 13

Suppose one food irradiation plant uses a 137 Cs source while another uses an equal activity of 60 Co . Assuming equal fractions of the rays from the sources are absorbed, why is more time needed to get the same dose using the 137 Cs source?

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Chapter 6 Core concept Electric and magnetic fields interact and can produce forces 1. Electric charge (q) unit: coulomb (c)- see slide 2 The kind of charge- positive-proton Negative-electron  Unit of charge= coulomb o Equivalent to charge of 6.24x10^18 o Metric unit of charge  Electron charge o Fundamental charge o Smallest seen in nature o Quantity of charge and the number of electrons An electron charge can be produced by: friction, contact, induction/polarization Slide 3:  Charges in matter  Inseparable property of certain particles  Electrons: negative electric charge  Protons: positive electric charge  Charge interaction  Electric force  “like charges repel; unlike charges attract”  Ions: non- zero net charge from loss/gain of electrons Slide 11: Coulumb’s law  Relationship giving force between two charges  Similar to Newton’s law of gravitation  K versus G implies gravity weaker Equation 6.2 Charge interaction: like charges repel, unlike attracts [6.1] Quality of charge= (# of electrons) (electron charge) q=ne e= 1.6x10^-19 C Example: 1c = n(1.6x10^-19 C) 1.6x10^-19c 1.6x10^-19c n= 1 1.6x10^-19 n=6.24x10^18 I-clicker questions 1. In an experiment in the late 1800’s, J.J. Thomson discovered that all matter contained negatively charged particles.

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##### ISBN: 9781938168932

This textbook survival guide was created for the textbook: College Physics for AP® Courses, edition: 1. Since the solution to 13 from 32 chapter was answered, more than 241 students have viewed the full step-by-step answer. This full solution covers the following key subjects: . This expansive textbook survival guide covers 34 chapters, and 2282 solutions. The answer to “Suppose one food irradiation plant uses a 137 Cs source while another uses an equal activity of 60 Co . Assuming equal fractions of the rays from the sources are absorbed, why is more time needed to get the same dose using the 137 Cs source?” is broken down into a number of easy to follow steps, and 46 words. College Physics for AP® Courses was written by and is associated to the ISBN: 9781938168932. The full step-by-step solution to problem: 13 from chapter: 32 was answered by , our top Physics solution expert on 03/09/18, 08:07PM.

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Suppose one food irradiation plant uses a 137 Cs source while another uses an equal