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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5. Calculate the total power radiated per unit area by a tungsten filament at a temperature of 3000. K. (Assume that the filament is an ideal radiator.) (b) If the tungsten filament of a lightbulb is rated at 75.0 W, what is the surface area of the filament? (Assume that the main energy loss is due to radiation.)
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
An infrared satellite measures outgoing radiation that leaves Earth's surface through an atmospheric window. The observed spectral irradiance at a wavelength of 10 μm is 2.199×107 W m-2 m-1. What is the temperature of the surface? Give your answer in K.

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Physics for Scientists and Engineers with Modern Physics

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