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.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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