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A 5.0 105 Bq 241Am alpha source is used in a smokealarm. The device is arranged so that

Modern Physics for Scientists and Engineers | 4th Edition | ISBN: 9781133103721 | Authors: Stephen T. Thornton, Andrew Rex ISBN: 9781133103721 454

Solution for problem 49 Chapter 13

Modern Physics for Scientists and Engineers | 4th Edition

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Modern Physics for Scientists and Engineers | 4th Edition | ISBN: 9781133103721 | Authors: Stephen T. Thornton, Andrew Rex

Modern Physics for Scientists and Engineers | 4th Edition

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Problem 49

A 5.0 105 Bq 241Am alpha source is used in a smokealarm. The device is arranged so that 15% of the decayalphas are detected. (a) What current is detected?(b) If the introduction of smoke causes a 10% changein the intensity of the alpha particles, what sensitivitymust the electronic circuit have to cause an alarm?

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1. Transforming energy A. Energy is not lost it is just converted to less important forms B. Work into a system: positive C. Work out of a system: negative D. Work includes electric energy into and out of motors and generators E. Energy output= energy input F. Thermal energy is irreversible a. Energy isn't lost but it is less efficient 2. Efficiency A. A. Larger the loss of energy in a system, the lower the efficiency a. Comes from 1. Process limitations 2. Fundamental limitations 1. 1. Energy in the body A. Energy inputs a. ATP b. Burning food transform

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Chapter 13, Problem 49 is Solved
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Textbook: Modern Physics for Scientists and Engineers
Edition: 4
Author: Stephen T. Thornton, Andrew Rex
ISBN: 9781133103721

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A 5.0 105 Bq 241Am alpha source is used in a smokealarm. The device is arranged so that