Two concentric spheres of diameter D₁ = 0.9 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 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 = i W (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and 82 0.05, in W? 912 = W (c) What is the net rate of radiation exchange if D₂ is increased to 20 m, with 2 = 0.05, ₁ = 0.5, and D₁ = 0.9 m, in W? 912 = W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (2 = 1.0) and with &1 = 0.5, D₂ = 20 m, and D₁ = 0.9 m, in W? 912 = W

Elements Of Electromagnetics
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Two concentric spheres of diameter D1= 0.9 m and D2= 1.2 m are separated by an air space and have surface temperatures of T1= 400 K and T2= 300 K. (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? q12= Enter your answer for part

(a) in accordance to the question statement W (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ε1= 0.5 and ε2= 0.05, in W? q12= Enter your answer for part

(b) in accordance to the question statement W (c) What is the net rate of radiation exchange if D2 is increased to 20 m, with ε2= 0.05, ε1= 0.5, and D1= 0.9 m, in W? q12= Enter your answer for part

(c) in accordance to the question statement W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (ε2= 1.0) and with ε1= 0.5, D2= 20 m, and D1= 0.9 m, in W? q12= Enter your answer for part

(d) in accordance to the question statement W

Two concentric spheres of diameter D₁ = 0.9 m and D₂ = 1.2 m are separated by an air space and have surface
temperatures of T₁ = 400 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 =
W
(b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with &₁ = 0.5 and
82= 0.05, in W?
912
i
W
=
(c) What is the net rate of radiation exchange if D₂ is increased to 20 m, with 2
m, in W?
0.05, 1 = 0.5, and D₁ = 0.9
912 =
i
W
(d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (2 = 1.0) and with
1 = 0.5, D₂ = 20 m, and D₁ = 0.9 m, in W?
912 = i
W
Transcribed Image Text:Two concentric spheres of diameter D₁ = 0.9 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 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 = W (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with &₁ = 0.5 and 82= 0.05, in W? 912 i W = (c) What is the net rate of radiation exchange if D₂ is increased to 20 m, with 2 m, in W? 0.05, 1 = 0.5, and D₁ = 0.9 912 = i W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (2 = 1.0) and with 1 = 0.5, D₂ = 20 m, and D₁ = 0.9 m, in W? 912 = i W
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