2) A small metal object, initially at T; =1000 K, is cooled by radiation in a low- temperature vacuum chamber. One of two thin coatings can be applied to the object so that spectral hemispherical emissivities vary with wavelength as shown. For which coating will the object most rapidly reach a temperature of T;= 500 K?| 1.0 Coating A Coating B లో 0.5 10 100 2 (µm)

The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown. Assume that a₁ = 0.8. xx α 0 0 2 4 6 λ (μm) What is the total, hemispherical absorptivity of the surface? α = i G₂(W/m².μm) 5000 2 4 6 λ (um) If it is assumed that ε = α and that the surface is at 900 K, what is its total, hemispherical emissivity? 8 = i What is the net radiant heat flux to the surface, in W/m²? qad.net = i W/m²

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Do 2,3