Consider the following statements: Statement-I: The atmosphere is heated more by incoming solar radiation than by terrestrial radiation. Statement-II: Carbon dioxide and other greenhouse gases in the atmosphere are good absorbers of long wave radiation. Which one of the following is correct in respect of the above statements?
ABoth Statement-I and Statement-II are correct and Statement-II explains Statement-I
BBoth Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
CStatement-I is correct, but Statement-II is incorrect
DStatement-I is incorrect, but Statement-II is correct
Answer & Solution
Correct answer: D. Statement-I is incorrect, but Statement-II is correct
Answer: D. Statement-I is INCORRECT, Statement-II is CORRECT.
The atmosphere is heated MORE by terrestrial (long-wave) radiation than by direct solar (short-wave) radiation. Incoming solar radiation is largely short-wave and passes through the atmosphere with little absorption; the Earth's surface absorbs it, warms up, and re-radiates as long-wave infrared. CO2, water vapour and other greenhouse gases are excellent absorbers of this long-wave IR — the greenhouse effect. So Statement-II is correct but Statement-I is reversed.
Source: NCERT Class 11 Fundamentals of Physical Geography, Ch 9 (Atmosphere).
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