Though all substances continuously emit electromagnetic radiation, the dominant form that such energy takes depends upon its nature and the form of the applied external excitation; electrical conductors emit radio waves when excited by an alternating current; certain elements emit X-rays if excited by atomic bombardment; if elevated to a sufficiently high temperature all substances will emit visible light. Cosmic rays, X-rays, γ-rays, visible light, radio waves etc. are all different forms of electromagnetic radiation. Figure 2.1.1 delineates the entire electromagnetic wave spectrum.
KeywordsSolar Radiation Solar Energy Horizontal Surface Diffuse Component Direct Solar Radiation
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