|Figure 6f-2: Spectrum of the Sun. The Sun emits most of its radiation in a wavelength band between 0.1 and 4.0 micrometers (µm).|
|Figure 6f-3: Spectrum of the Earth. The Earth emits most of its radiation in a wavelength band between 0.5 and 30.0 micrometers (µm).|
- The amount of radiation emitted from a body increases exponentially with a linear rise in temperature (see above Stephan-Boltzmann's Law).
- The average wavelength of electromagnetic emissions becomes shorter with increasing temperature (see above Wien's Law).
|Figure 6f-4: Diagram illustrating the diffusion of radiation due to the Inverse Square Law.|
Intensity = I/d2
Intensity = 90,000/22
Intensity = 90,000/4
Intensity = 22,500 units
Intensity = 90,000/32
Intensity = 90,000/9
Intensity = 10,000 units
What would be the intensity of emitted radiation traveling four units of distance if the intensity at 1d = 90,000 units?