Physics, 26.02.2020 20:31 barkonatree

The intensity of electromagnetic waves from the sun is 1.4 kW/m2 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 25 cm * 52 cm rectangle. How many joules of solar energy fall on your back as you work on your tan for 0.90 h? Answer in Joules.

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