Modern Physics For Scientists And Engineers - 4 Edition - Chapter 13 - Problem 49
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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

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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