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A very small sample with an opaque surface is placed in a very large enclosure whose walls have an emissivity of 0.2 and are maintained at a uniform temperature of 2400 K. The temperature of the sample is initially at a uniform temperature of 1200 K. The spectral, hemispherical absorptivity of the sample surface is shown below. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 4 8 10 a Sum)

A very small sample with an opaque surface is placed in a very large enclosure whose walls have an emissivity of 0.2 and are maintained at a uniform temperature of 2400 K. The temperature of the sample is initially at a uniform temperature of 1200 K. The spectral, hemispherical absorptivity of the sample surface is shown below. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 4 8 10 a Sum)

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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a. What is the total, hemispherical absorptivity of the sample surface? 

b. What is the inital vale of the total, hemispherical emissivity of the sample surface?

c. What is the value of the total, hemispherical emissivity of the sample surface after the sample has been in the enclosure for a very long time?

A very small sample with an opaque surface is placed in a very large enclosure whose walls have an emissivity of 0.2 and are maintained at a uniform temperature of 2400 K. The temperature of the sample is initially at a uniform temperature of 1200 K. The spectral, hemispherical absorptivity of the sample surface is shown below. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4 8 10 A (µm) 2.
Transcribed Image Text:A very small sample with an opaque surface is placed in a very large enclosure whose walls have an emissivity of 0.2 and are maintained at a uniform temperature of 2400 K. The temperature of the sample is initially at a uniform temperature of 1200 K. The spectral, hemispherical absorptivity of the sample surface is shown below. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4 8 10 A (µm) 2.
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