Artificial sources such as radio and television

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Unformatted text preview: around us. Artificial sources such as radio and television, microwave radar detection systems, telephone signals, light bulbs, and medical equipment, are also contributors. We have learned a great deal about nature and the structure of the atom by monitoring radiation with microscopes, telescopes and other scientific equipment. The continuum of this radiation is known as the electromagnetic spectrum. It includes x- rays and gamma rays; ultra- violet, visible, and infrared light; microwaves and radiowaves. Human vision is limited to the very narrow band of visible light. Electromagnetic radiation can be described as a wave characterized by two interdependent variables: Fre que ncy, ν (nu), is the number of waves passing a certain point per second. Frequency is measured in Hertz (Hz). 1 Hz = 1 cycle/sec. Wave le ngth, λ (lambda), is the distance between a point on one wave and the corresponding point on the next wave. Wavelength is measured in units of length, which are convenient for the type of radiation bei...
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This document was uploaded on 01/22/2014.

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