Nearly 30% of the solar radiations return back to the space without contributing anything to the earth`s surface temperature. This amount of radiation is known as

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Q: 72 (CDS-I/2013)
Nearly 30% of the solar radiations return back to the space without contributing anything to the earth's surface temperature. This amount of radiation is known as—

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,113,22,12,7,113,3

keywords: 

{'solar radiations': [0, 0, 0, 2], 'albedo': [0, 0, 1, 1], 'radiation': [0, 0, 1, 0], 'surface temperature': [1, 0, 0, 1], 'space': [4, 1, 7, 12], 'tropopause': [1, 0, 0, 4], 'earth': [0, 1, 1, 1], 'black body': [0, 0, 0, 1]}

The correct answer is option 3, earth`s albedo.

Albedo refers to the measure of how much light or radiation is reflected by a surface. In the context of the Earth, it refers to the amount of solar radiation that is reflected back into space without contributing to the Earth`s surface temperature.

When solar radiation reaches the Earth, some of it is absorbed by the atmosphere and the Earth`s surface, while the rest is reflected back into space. The Earth`s albedo is the percentage of radiation that is reflected. In this case, about 30% of the solar radiation is reflected back into space without contributing to the Earth`s surface temperature.

Options 1, 2, and 4 are incorrect.

1) Black body refers to an idealized object that absorbs and emits all incident radiation. It is not applicable in this context.

2) Tropopause refers to the boundary between the troposphere and the stratosphere. It is not related to the reflection of solar radiation.

4) Mesopause refers to the boundary between the mesosphere and the thermosphere. It is also not related to the reflection of solar radiation.