General science UPPSC 1997 GS-I
Question

Assertion (A): The atmosphere receives most of the heat only indirectly from the sun and directly from the earth's surface.
Reason (R): The conversion from shortwave solar to long-wave terrestrial energy takes place at the earth's surface.

Code:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Both A and R are true and R is the correct explanation of A

Detailed Solution:

The correct answer is “Both A and R are true and R is the correct explanation of A”.

While the atmosphere does receive some heat directly from the sun, the majority of its heating comes from the earth's surface after it absorbs solar radiation and re-emits it as infrared radiation.

Solar energy reaches the earth as shortwave radiation. The earth absorbs this energy and re-emits it as longwave (infrared) radiation, which heats the atmosphere.

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