Question
For this problem, treat the following hypothetical samples as opaque, diffuse surfaces in thermal equilibrium. Their spectral emissivities are constant over the 8.00–9.20 μm band: A. Grass sample: 0.98 B. Concrete sample: 0.90 C. Sandy-loam sample: 0.94 D. Clear-water sample: 0.99 Using \(\rho=1-\varepsilon\), arrange these specified samples in ascending order of reflectance.
The correct answer is
D, A, C, B
The specified reflectances are A = 0.02, B = 0.10, C = 0.06 and D = 0.01. Thus D, A, C, B is the ascending order. The result follows from the supplied sample values and opacity assumptions; it is not a universal ranking of all grass, concrete, soil and water surfaces.
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