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Chapter 16: Q. 34 (page 452)

The intensity of electromagnetic waves from the sun is 1.4 kW/m2 just above the earth鈥檚 atmosphere. Eighty percent of this reaches the surface at noon on a clear summer day. Suppose you think of your back as a 30 cm * 50 cm rectangle. How many joules of solar energy fall on your back as you work on your tan for 1.0 h?

Short Answer

Expert verified

Solar energy is 6脳105J.

Step by step solution

01

Given information

The intensity of electromagnetic waves is I=1.4kW/m2

The area of a rectangle is a=0.30m脳0.50m

Time t=1.0h=3600s

02

Power of the wave

The intensity of the wave is given by I=Pa

Substitute given values

P=Ia=1.4脳103脳0.30脳0.50=210W

03

Energy of the wave

The energy of the wave is given by E=Pt=Iat

Substitute the given values

E=0.80脳210脳3600=6脳105J

Therefore, the energy of the wave is 6脳105J.

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