The spectral emissivity and spectral reflectivity of a diffuse surface are given below: 1.0 0.2 0.2 0.1 1.40 3.0 λίμm) 1.40 3.0 λ(μη) i- K. Determine the total emissive power of the surface (in W/m²) if the surface is at 2000 Determine the absorptivity and reflectivity of the surface for radiation coming from the source at temperature of 1000 K. ii- iii- Sketch the spectral transmissivity, t iv- What is the total absorptivity of the surface for the irradiation depicted below? 5000 1.0 2.0 3.0 4.0 5.0 1 (um)

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The spectral emissivity and spectral reflectivity of a diffuse surface are given below:
1.0
0.2
0.2
0.1
1.40
3.0 λ (μm)
1.40
3.0 λ (μm)
i-
Determine the total emissive power of the surface (in W/m²) if the surface is at 2000
K.
ii-
Determine the absorptivity and reflectivity of the surface for radiation coming from
the source at temperature of 1000 K.
Sketch the spectral transmissivity, t
What is the total absorptivity of the surface for the irradiation depicted below?
iii-
iv-
5000
1.0 2.0 3.0 4.0 5.0
1 (um)
Transcribed Image Text:The spectral emissivity and spectral reflectivity of a diffuse surface are given below: 1.0 0.2 0.2 0.1 1.40 3.0 λ (μm) 1.40 3.0 λ (μm) i- Determine the total emissive power of the surface (in W/m²) if the surface is at 2000 K. ii- Determine the absorptivity and reflectivity of the surface for radiation coming from the source at temperature of 1000 K. Sketch the spectral transmissivity, t What is the total absorptivity of the surface for the irradiation depicted below? iii- iv- 5000 1.0 2.0 3.0 4.0 5.0 1 (um)
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