Question

Which type of radiation is primarily emitted by the Earth's surface?

• A. Ultraviolet radiation
• B. Shortwave radiation
• C. Longwave (infrared) radiation
• D. Gamma radiation

Hint:

\textbf{Sun = Shortwave}, \textbf{Earth = Longwave (Infrared)}.

Answer 1

The Correct Option is C

Concept: The Earth absorbs incoming solar radiation and re-emits energy back into the atmosphere based on its temperature.
Step 1: Understanding radiation types.
The Sun emits shortwave radiation, while the Earth, being cooler, emits longwave radiation.
Step 2: Identifying Earth's emission.
The Earth's surface primarily emits infrared (longwave) radiation.
Step 3: Eliminating incorrect options.

• Ultraviolet and shortwave radiation are mainly solar.
• Gamma radiation is not relevant in this context.

Conclusion:
Thus, the correct answer is Longwave (infrared) radiation.