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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’s 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 6×105J.

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×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=1.4×103×0.30×0.50=210W

03

Energy of the wave

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

Substitute the given values

E=0.80×210×3600=6×105J

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

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