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Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ - 410 K and T₂ = 300 K. = (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and … -0.05, in W? W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with ₂ - 0.05, ₁ = ( D₂ 0.5, and 0.8 m, in W? D₁ = W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (2= 1.0) and with = 0.5, D₂ = 20 m, and D₁ = 0.8 m, in W? 912 =

Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ - 410 K and T₂ = 300 K. = (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and … -0.05, in W? W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with ₂ - 0.05, ₁ = ( D₂ 0.5, and 0.8 m, in W? D₁ = W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (2= 1.0) and with = 0.5, D₂ = 20 m, and D₁ = 0.8 m, in W? 912 =

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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Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T = 410 K and ₂ = 300 K. T₁ (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with = 0.5 and 0.05, in W? E W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with = 0.05,= 0.5, and 0.8 m, in W? D₂ 82= D₁ = W 912= (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (42= E 1.0) and with ₁ = 0.5, D₂ = 20 m, and D₁ = 0.8 m, in W? 912 = W
Transcribed Image Text:Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T = 410 K and ₂ = 300 K. T₁ (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with = 0.5 and 0.05, in W? E W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with = 0.05,= 0.5, and 0.8 m, in W? D₂ 82= D₁ = W 912= (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (42= E 1.0) and with ₁ = 0.5, D₂ = 20 m, and D₁ = 0.8 m, in W? 912 = W
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