Assertion A The atmosphere receives most of the heat only indirectly from the sun and directly from ...........

World Geography (Easy) World climates

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 short-wave solar to long wave terrestrial energy takes place at the earth’s surface.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false.

A is false but R is true.

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Explanation:

A is false but R is true.

Earth receives Sun’s radiation (heat) in the form of short waves (visible light + wavelengths below visible light – most of it is ultraviolet radiation) which are of electromagnetic nature. The earth absorbs short wave radiation during daytime and reflects back the heat received into space as long-wave radiation (mostly infrared radiation) during night. Most of the light received by earth is scattered light.
The amount of insolation received on the earth’s surface is far less than that is radiated from the sun because of the small size of the earth and its distance from the sun.
The long-wave radiation is absorbed by the atmospheric gases particularly by carbon dioxide and other greenhouse gases. Thus, the atmosphere is indirectly heated by the terrestrial radiation.