1) (5 points) A surface is described with the following properties: its absorpti

Question

1) (5 points) A surface is described with the following properties: its absorptivity when irradiated with sunlight is &s-0.75;, it's emissivity at T-300K is ?-0.15, which of the following statements is true? (circle all that apply) A. B. C. D. E. This surface has an emissivity that varies with wavelength. This surface does not obey Kirchhoff's Law in its most general (fundamental) form If the temperature of this surface increased, its emissivity would increase. This surface must not be in thermal equilibrium. This surface is a good solar reflector

Explanation / Answer

options a,c,e

since it has to obey kirchoffs law as the sum of transmissibility,reflectivity,emissivity should be one, so it has to be in thermal equlibrium

here,emissivity is proportional to wavelength and temperature

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