Discussion
Earth's atmosphere is transparent to infrared radiation in the wavelength band which is called atmospheric window :
Answer: A
The atmospheric window is the band of about 8 - 13 μm.
In this part of the thermal infrared, water vapour and carbon dioxide absorb only weakly, so much of the long-wave radiation emitted by the Earth's surface (which peaks near 10 μm) escapes directly to space. Only the ozone band at about 9.6 μm sits inside the window. Thermal remote sensing satellites use this band for the same reason.
The other bands are strongly absorbed: 5 - 7 μm lies in the water vapour band centred near 6.3 μm, and 14 - 17 μm lies in the strong carbon dioxide band centred near 15 μm. A band of 7 to 20 μm is far too wide and includes both of those absorption regions.
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