A large diffuse surface has spectral absorptivity of a=0.9 for 2 <1 jam and a=0.2 for 221 m. The surface is insulated in the bottom, and exposed to two different conditions on thetop:sunInsulatedInsulatedCase (2)Case (1)6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffusesurface? Note that the sun emits approximately as a blackbody at 5800 K.Blackbody Radiation FunctionATAT306.48067763000430005160146000.00001640000.379210AND6407554000213466337471405300endy70LND0019715400.0093415.4000.301046200053006.7201782300.066728JOH0.140256ARD6.7376186.7541408.1801304227697AND67631999250103.000EXXION33003183026.8192173,4007400.40360776008.6391027N06-2) Case 1): The surface is exposed to the sun and G. 1200 W/m². Flowing air temperatureTe is 300 K. Assuming the surface temperature of 7,- 320 K, what is the convective heattransfer coefficient ? The answer should be given in the unit of W/(m²K).9

Answered: Image /qna-images/answer/28ebae2d-ea06-45fc-ab08-5eb67022fb84.jpg

A large diffuse surface has spectral absorptivity of a = 0.9 for λ < 1 jam and a = 0.2 for à 2 1 m. The surface is insulated in the bottom, and exposed to two different conditions on the top: sun T₂ Insulated Insulated Case (2) Case (1) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blacklody Radiation Function AT AT 4000 6480677 BOROD 6300014 0000000 LAB 0.000016 6.37920 GOMIZE AND 130 0.002134 BA33747 140 5300 BA70 LND 0019 5,400 BANO 1300 0.009341 2000 0672 5.300 6.720178 JOH AIRD 0.140256 6.754140 8.180130 6.40 6.769234 0227697 6783199 2899 02501 AND 6.796129 3.000 EXXION 8.273232 130 0318302 6X19217 3,400 7.40 6424527 0.403607 7400 8639102 AND #443382 THO BAAMOS 6-2) Case 1): The surface is exposed to the sun and G. 1200 W/m². Flowing air temperature Te is 300 K. Assuming the surface temperature of 7.- 320 K, what is the convective heat transfer coefficient ? The answer should be given in the unit of W/(m²K). NO

A large diffuse surface has spectral absorptivity of a = 0.9 for λ < 1 jam and a = 0.2 for à 2 1 m. The surface is insulated in the bottom, and exposed to two different conditions on the top: sun T₂ Insulated Insulated Case (2) Case (1) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blacklody Radiation Function AT AT 4000 6480677 BOROD 6300014 0000000 LAB 0.000016 6.37920 GOMIZE AND 130 0.002134 BA33747 140 5300 BA70 LND 0019 5,400 BANO 1300 0.009341 2000 0672 5.300 6.720178 JOH AIRD 0.140256 6.754140 8.180130 6.40 6.769234 0227697 6783199 2899 02501 AND 6.796129 3.000 EXXION 8.273232 130 0318302 6X19217 3,400 7.40 6424527 0.403607 7400 8639102 AND #443382 THO BAAMOS 6-2) Case 1): The surface is exposed to the sun and G. 1200 W/m². Flowing air temperature Te is 300 K. Assuming the surface temperature of 7.- 320 K, what is the convective heat transfer coefficient ? The answer should be given in the unit of W/(m²K). NO

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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2 parts ( C&D) Read and solve carefully please write clearly and box the final answer(s) label them Hint: Pay attention to numbers bolded
1) The spectral, hemispherical absorptivity of an opaque surface and the spectral irradiation at the surface are as shown. d' 1.0 G₂ (W/m².um) 500 0.2 0 0 0 2 4 6 8 10 12 14 16 0 2 4 6 8 10 12 14 16 λ(μm) λ(μm) a) How does the spectral, hemispherical reflectivity vary with wavelength? b) What is the total, hemispherical absorptivity of the surface? c) If the surface is initially at 500 K and has a total, hemispherical emissivity of 0.8, how will its temperature change upon exposure to the irradiation?
The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 um. If the peak wavelength of emitted radiation changes to 2.90 um, then the temperature (in K) of the black body is A. 500 B. 1000 C. 4000 D. 8000
Solve fast
3. A star has a surface temperature of 5,500K. Determine the radiative heat transfer received by planet Z in Petawatts with diameter of 2100 km, temperature of surface of 300K and mean absorptivity of 0.8. Radiative energy loss due to radiation dispersion on outer space is 99%.
please show all steps, not Ai generated
An opaque surface has the spectral, hemispherical reflectivity distribution as shown below. The surface receives the spectral irradiation shown below. A. Determine the total irradiation on the surfaceB. Determine the radiant flux that is absorbed by the surface
Two point sources of coherent light with a wavelength of 700 nm are near each other. The light from these sources is interfering in space around them. If you determine there is destructive interference between the two sources at a point 70.35 μm away from the second source, how far away from this point might the first source be? (Note that the image shown is not drawn to scale.) Source 1 74.20 μm o 77.175 um - 80.85 um ○ 80.85 μm 80.85 μm ? Source 2 70.35 μm destructive interference here
6.4 Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K. The plates are made from the same metal, and their spectral emissivities as a function of wavelength, &, are approximated as shown by two constant values joined by a linear decrease with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2. What is the energy flux if both plates are assumed gray with an approximate average emissiv- ity of 0.5 applied over the entire spectral range? 91 T₁ = 1400 K, Ex T₂ = 700 K, EX 92-91 0.85 Ex 0.15 0 Answer: q₁106,850 W/m²; 91.gray = 68,070 W/m². 2 λ (μm) 7
7. The emissive power of a blackbody, at 0.8 µm wavelength is measured as 1E5 W/m², µm. Find the blackbody temperature. [Ans. 1739 K]