RSS FeedsHow many joules of solar energy fall on your back as you work on your tan for 0.70h?
July 6th, 2009
The intensity of electromagnetic waves from the sun is 1.4 kW/m^2 just above the earth’s atmosphere. Eighty percent of this reaches the surface at noon on a clear summer day.
Suppose you model your back as a 27cm & 51cm rectangle.
How many joules of solar energy fall on your back as you work on your tan for 0.70h?
80% of 1.4 = 1.12 kW / m²
Area = 0.27 * 0.51 = 0.138 m²
Power = 1.12 * 0.138 = 0.154 kW
Energy = Power * Time
Time = 0.7 * 3600 = 2520 seconds
Energy = 0.154 * 2520 = 389 Joules
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July 6th, 2009
80% of 1.4 = 1.12 kW / m²
Area = 0.27 * 0.51 = 0.138 m²
Power = 1.12 * 0.138 = 0.154 kW
Energy = Power * Time
Time = 0.7 * 3600 = 2520 seconds
Energy = 0.154 * 2520 = 389 Joules
References :
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