Consider the following statements 1 Earth absorbs only the long wave radiation coming from the Sun 2...........

General Studies ( Prelim) Geography

Consider the following statements:

1. Earth absorbs only the long-wave radiation coming from the Sun.

2. Out of total radiation coming to Earth from the sun, more than 50% is reflected back to space by clouds. Which of the statements given above is/are incorrect?

1 only

2 only

Both 1 and 2

Neither 1 nor 2

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Explanation:

Statement 1 is incorrect. Solar energy enters our atmosphere as shortwave radiation in the form of ultraviolet UV rays and visible light. Earth’s surface absorbs this short-wave radiation and re-emits the energy as long-wave radiation in the form of infrared rays.

Statement 2 is incorrect. It is estimated that of the total radiation coming to us, 35% is directly reflected to space by dust, clouds and air molecules. Another 14% is absorbed by water vapor, carbon dioxide and other gases. The remaining 51% reaches the earth and warms the surface.

Although the Earth maintains a balance between insolation and terrestrial radiation, we do not see this at all latitudes. The amount of insolation in the tropical zone is greater than the amount of terrestrial radiation.