GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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(a) radiated by the Sun
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b) re-radiated by land
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(c) re-radiated by water
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(d) re-radiated by land and water
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Detailed explanation-1: -The correct answer is A: Radiated by the sun. Explanation of the correct answer: The atmosphere of the earth is heated by radiation which is mainly by the radiation from the sun. The atmosphere is mainly heated by the long-wave terrestrial radiation.
Detailed explanation-2: -Greenhouse gases in the atmosphere (such as water vapor and carbon dioxide) absorb most of the Earth’s emitted longwave infrared radiation, which heats the lower atmosphere.
Detailed explanation-3: -The earth emits radiation primarily in the visible spectrum. The sun emits radiation primarily in the UV, or ultraviolet, and visible spectrum.
Detailed explanation-4: -The upper layer of the atmosphere retains some heat from the sun’s rays as they pass through the atmosphere. The sum of insolation obtained on the surface of the earth is much less than that radiated from the sun because of the small size of the earth and its distance from the sun.