What phenomenon causes the Earth's outgoing energy emission to fall predominantly between about 4 and 100 micrometers?

Answer

The object being the thermal infrared range.

The dominant emission for an object like Earth, given its cooler temperature, falls into the thermal infrared range, specifically corresponding to wavelengths between about 4 and 100 micrometers.

What phenomenon causes the Earth's outgoing energy emission to fall predominantly between about 4 and 100 micrometers?
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