Modern Electrical Theory

Modern Electrical Theory

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...of the line, or the range of the frequencies within which the intensity is finite, varies enormously with the condition of the source; if this is a gas excited by an electrical discharge, the breadth increases with the pressure of the gas and also with its temperature. On the view that has been suggested that the disturbances constituting light consist of oscillations lasting only for a finite time, the finite breadth of the lines can be readily explained. If these oscillations during the greater part of the time that the disturbance lasts can be represented by (186) and if the period at the two ends of the disturbance during which it is excited and decays is small compared with the period during which these regular vibrations continue, then a beam of light consisting of a large number of such disturbances would be resolved into just such a line as is found in practice; the breadth of the line would really be infinite, but the intensity of the portions which lie at any considerable distance from the maximum (which represents the frequency of the harmonic vibrations) will be so small as to be inappreciable. Further, from the range within which it is appreciable, that is the breadth of the line, can be deduced some information concerning the period within which the regular harmonic vibrations continue undisturbed. In the case of the narrowest lines which have been observed this period must be several hundred thousand times that of a single vibration1. It may be supposed that the number of regular vibrations which the atom of a gas can emit is determined by the time that it is free between two collisions with other atoms, or, possibly, with electrons; such collisions would probably lead to a disturbance of the oscillations and a break in the...
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Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236652193
  • 9781236652195