On the planet Mars, the power per unit area in sunlight is F = 590Wm-2 ....

On the planet Mars, the power per unit area in sunlight is F = 590Wm^-2 . Mars’s emissivity for infrared radiation is = 0.93. If the surface temperature on Mars is -60 C, what fraction (to within a few percent) of the sunlight shining on Mars gets absorbed? (a) less than 1% (b) 75% (c) 20% (d) 30%

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