A if the suns emissivity is e 10 what total power does it, Ask an Expert

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a) If the Sun's emissivity is E = 1.0, what total power does it radiate? Consider a disk witli the same radius as the Earth's (RE = 6.4 x 106 m) and the same distance to the Sun (r = 1.50 x 1011 m), that is oriented with its surface perpendicular to the direction of the Sun. For light with wavelengths that correspond to (visible) Sunlight, the disk's emissivity is Evis = 0.25.

b) What is the total power of Sunlight that is absorbed by the disk? The disk reradiates this power back to outer space as infrared light.

c) If the disk's emissivity for infrared light wavelengths is EIR = 1.0, what will the disk's temperature be?

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