UPPSC 2022 GS-I Indian Geography
Question

The earth atmosphere is mainly heated by which one of the following ?

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Long wave terrestrial radiation

Detailed Solution:

The correct answer is “Long wave terrestrial radiation”.

The Earth's surface absorbs solar energy and re-emits it as long-wave infrared radiation (terrestrial radiation). This is a key process in warming the atmosphere, as this radiation is absorbed by greenhouse gases in the atmosphere, leading to the greenhouse effect.

While some solar radiation is scattered in the atmosphere, it primarily contributes to daylight and does not directly heat the atmosphere significantly.

Some solar radiation is reflected back into space by clouds and the Earth's surface (albedo effect), which does not contribute to warming the atmosphere.

This radiation from the sun does reach the Earth, but it is primarily absorbed by the surface rather than heating the atmosphere directly.

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