【Daily Question】Theoretical Foundation 2020.12.25
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Multiple-choice question: The question is shown in the image ( ). Answer: D. Hint: An additional reward will be given to those who can explain the solution process; the answer can be submitted there
The temperature in outer space, beyond the atmosphere, is close to absolute zero, making it an ideal cold source. In the 8–13 μm wavelength range, the absorption by carbon dioxide and water vapor in the atmosphere is very low, allowing for high levels of penetration. Ground-based objects can use this window to radiate heat into outer space, thereby achieving a certain degree of cooling. This situation occurs because, in clear weather, direct radiation exchange between the surface of the plants and space causes the temperature of their surfaces to drop to the freezing point.