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.

Question

Nylah Hanna

30 November, 07:53

+4

Answers (1)

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Benjamin Cohen · Answer 1

4.7 * 10⁵J

Explanation:

E = I * a * t

80% = 0.80

25cm = 0.25m

52cm = 0.52m

0.90h = 3240s

E = (0.80) (1400) (0.25 * 0.52) (3240)

= 4.7 * 10⁵J