On a still clear night, the sky appears to be a blackbody with an equivalent temperature of 250 K. What is the air temperature when a strawberry field cools to 0°C and freezes if the heat transfer coefficient between the plants and the air is 6 W/m2•oC because of a light breeze and the plants have an emissivity of 0.9?
(a) 14oC
(b) 7oC
(c) 3oC
(d) 0oC
(e) –3°C
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