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

Solution for problem 49 Chapter 13

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


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

Chapter 13, Problem 49 is Solved

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