Which is a good estimate for the amount of solar irradiance hitting the Earth’s surface on a clear day? Select only one. 1) 1kcal/ft^2 2) 1w/m^2 3) 100J/m^2 4) 1kw/m^2 5) 1BTU/ft^2
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On a clear day, when the Sun is directly overhead, the radiation intensity that is hitting the ground, directly from the Sun is around 1000-1050 W/m2.
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