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)? 36.8

College Physics
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Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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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
Transcribed Image Text: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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