e. How much of the radiation received from the sun does the earth reflect?
(1) about half
(ii) about one – fourth
(111) all of it
(iv) about three – fourth
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Explanation:
In total approximately 70% of incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface.
~30% is directly reflected back to space by clouds, the earth's surface and different gases and particles in the atmosphere (the earth's albedo is 0.3 on average). ~20% is absorbed by the atmosphere and clouds.
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