On a clear day at noon, the intensity of solar energy reaching the earth's surface is about:
Correct answer: A. 1.0 kWm-2
- A. 1.0 kWm-2
- B. 1.4 kWm-2
- C. 1.0 Wm-2
- D. 1.4 Wm-2
Explanation
The correct answer is 1.0 kWm-2 because this is the standard value of solar irradiance reaching the Earth's surface on a clear day at noon. Option B, 1.4 kWm-2, is incorrect as it is closer to the solar constant, which is the amount of solar energy received per unit area outside the Earth's atmosphere. Options C and D, 1.0 Wm-2 and 1.4 Wm-2, respectively, are incorrect as they are orders of magnitude lower, misrepresenting the actual solar energy reaching the surface.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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