Physics for Scientists and Engineers with Modern Physics
Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Chapter 38, Problem 11Q
To determine

Whether the temperature reading of the thermometer is the same as the temperature of the hot soup before the measurement was made.

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Thermal emission from forehead. Noncontact thermom- eters are used to quickly measure the temperature of a person, to monitor for fever from an infection. They measure the power of the radiation from a surface, usually the forehead, in the infrared range, which is just outside the visible light range. Skin has an emissivity & = 0.97. What is the total power (infrared and vis- ible) of the radiation per unit area when the temperature is (a) 97.0°F (a common early morning temper- ature), (b) 99.0°F (a common late afternoon temperature), and (c) 103°F (a temperature indicating infection)? ww 36.8
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Physics for Scientists and Engineers with Modern Physics

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