Environmental Engineering Reference
In-Depth Information
Figure 2.7
Variation in the intensity of black-body radiation
with wavelength: (a) T =6000 K (approximately the emission
temperature of the sun); (b) T =200 K, 250 K and 300 K (the
range of Earth emission temperatures). Note the differences
in scale. K is Kelvin, based on absolute zero (−273° C).
Source: After Neiburger et al. (1982).
Figure 2.8
The inverse square law. Intercept area at distance
d from source is just one-fourth that at distance 2d; energy
passing through area A is spread over an area four times as
large at B.
