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 31 cm × 48 cm rectangle. How many joules of solar energy fall on your back as you work on your tan for 1.5  h? Express your answer in joules

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Chapter16: Waves
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Problem 131AP: A wave on a string is driven by a string vibrator, which oscillates at a frequency of 100.00 Hz and...
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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 31 cm × 48 cm rectangle. How many joules of solar energy fall on your back as you work on your tan for 1.5  h? Express your answer in joules.

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