Discussion
What range of electromagnetic radiation are most abundantly emitted by the Earth surface ?
Answer: D
The Earth's surface emits mostly Infrared radiation.
The surface has a mean temperature of about 288 K. By Wien's law its emission peaks at
\[ \lambda_{m} = \frac{2898}{288} \approx 10\ \mu\text{m} \]
which lies in the thermal infrared, roughly 4 to 100 micrometres. This outgoing long-wave radiation is what greenhouse gases absorb.
Ultraviolet needs a body as hot as the Sun. Microwave and radio waves are emitted by the Earth too, and are used in passive remote sensing, but they carry only a tiny fraction of the energy.
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