The Electromagnetic Radiation Spectrum

The space of our universe is not empty. It is laden with radiation that comes from the sun and from other luminous stars, as well as from general sources, called cosmic 

Buildings Humans Honeybee Pinpoint Protozoans Molecules Atoms Atomic nuclei 

As can he seen from the figure, the wavelengths and frequencies span more than 15 orders of magnitude. In the middle of the spectrum, we find VIS light, which is called 

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Analysis of the electromagnetic radiation spectrum emanating from the star Sirius shows that = 260 nm. Estimate the surface temperature of Sirius. 

Light near the middle of the ultraviolet region of the electromagnetic radiation spectrum has a frequency of 2.73 X s L Yellow light near the middle of the visible region of the spectrum has a frequency of 5.26 X 10 s L Calculate the wavelength that corresponds to each of these two frequencies of light. 

Microwaves (0.3-300 GHz) lie between radiowave (RF) and infrared (IR) frequencies in the electromagnetic radiation spectrum. Microwaves can be reflected, absorbed and/or transmitted by materials. Microwaves can interact with materials through either polarization or conduction processes. Polarization involves the short-range displacement of charge through... 

Electrons are very energetic species. They are from the short wave length, high energy end of the electromagnetic radiation spectrum, as can be seen from Table 1. 

FIGURE 2.39 The electromagnetic radiation spectrum from IR to UV after (Putz, 2006). 

Absorption of light in the UV-visible part of the electromagnetic radiation spectrum is very sensitive to the oxidation state of conducting polymers. Light absorption causes electronic transition between the valence and conduction bands and the specific absorption peaks in the UV-visible spectrum are indicative of the nature of the charge carriers and the number of charge carriers present. 

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