Ultra-Violet Radiation Concordance
Ultra-Violet Radiation
Section titled “Ultra-Violet Radiation”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
105 hits
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3 sources
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10 sections
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Matched Aliases
Section titled “Matched Aliases”Ultra-violet radiation, actinic rays, ultra-violet, ultraviolet
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 91 | 8 |
| General Lectures on Electrical Engineering | 11 | 1 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 3 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 3: Physiological Effects Of Radiation - 43 hit(s)
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... of the speech are not recorded, while at the louder portions the recording point jumps and the voice breaks in the reproduction. 21. The sensitivity of the eye to radiation obviously changes with the frequency, as it is zero in the ultra-red, and in the ultra- violet — where the radiation is not visible — and thus gradually increases from zero at the red end of the spectrum to a maximum somewhere near the middle of the spectrum and then decreases again to zero at the violet end of the spectrum; that is, the physi- P ...Lecture 1: Nature And Different Forms Of Radiation - 18 hit(s)
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... rilliancy and more still in the mercury arc, radiations of higher frequencies appear, that is, shorter wave lengths than visible light, and these radiations are again invisible. As they are of frequencies beyond the violet rays of light, they are called " ultra-violet rays/' while the radia- tions which we produced from the heated silicon rods at moderate temperatures were invisible because of too low frequency and are thus called " ultra-red rays," or " infra-red rays/' as they are outside of and below the red end of ...Lecture 17: Arc Lighting - 11 hit(s)
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... amount of energy is less, it may not be possible to feel it, though with a sensitive instrument, as a bolometer, we may still be able to measure the heat. All radiations therefore are convertible into heat: the visible light waves as well as the invisible ultraviolet rays, and the — usually more powerful — long ultrared waves ; but none of the radiations can be called heat, no more than the mechanical momentum of a flywheel is heat, because when destroyed, it produces heat. If we consider the infinite range of radiat ...Lecture 4: Chemical And Physical Effects Of Radiation - 11 hit(s)
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... which photography is based : the dissociating action of radiation on silver salts, the chloride in ordinary photographic paper, the bromide and iodide in the negative plate and the quick printing papers. This chemical action is greatest in the violet and ultra-violet and decreases with increasing wave length, hence is less in the green, small in the yellow, and almost absent in the red and ultra-red, so that the short waves, blue, violet and ultra-violet, have sometimes been called " chemical rays." This, however, is ...Lecture 2: Relation Of Bodies To Radiation - 7 hit(s)
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... divided into two classes, the electric waves and the light waves, which are separated from each other by the blank space in the middle of the spectrum of radiation (Fig. 14). Under light waves we here include also the invisible ultra-red radiation and the ultra-violet radiation and the non-refrangible radiations, as X-rays, etc., separated from the latter by the second blank space of the radiation spectrum. In the following, mainly the light waves, that is, the second or high frequency range of radiation, will be discussed. The ...Lecture 6: Luminescence - 6 hit(s)
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... of the energy in the spectrum, which is more or less charac- teristic of the luminescent body, and to some extent, also, of the method of exciting the luminescence. Thus crystalline calcium tungstate, W04Ca, fluoresces white in the X-ray, light blue with ultra-violet light; the aniline dye, rhodamine, 6 G, in alcoholic solution fluoresces green in daylight, crimson in the light of the mercury lamp; willemite (calcium silicate) shows a maximum fluorescent radiation in the green, some chalcites in the red, etc. So far, ...Lecture 7: Flames As Illuminants - 3 hit(s)
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... entirely chemical lumi- nescence. Thus burning sulphur gives a blue flame, and, if the temperature of combustion is increased by burning the sulphur in oxygen, it gives a fairly intense light, of violet color, and a radiation which is very intense in the ultra-violet. Thus before development of the ultra-violet electric arcs, as the iron arc, for the production of ultra-violet radiation lamps were used, burning carbon bisulphide, CS2, in oxygen. Carbon bisulphide, has the advantage over sulphur that, as liquid, it can ...Chapter 6: Oscillating Currents, - 3 hit(s)
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... nd of the frequency of charge. 52. Example: Assume an oscillating-current generator, feed- ing a Tesla transformer for operating X-ray tubes, or directly supplying an iron arc (that is, a condenser discharge between iron electrodes) for the production of ultraviolet light. The constants of the charging circuit are: the impressed e.m.f., e = 15,000 volts; the resistance, r = 10,000 ohms; the inductance, L = 250 henrys, and the capacity, C = 2 X 10~ 8 farads = 0.02 mf. The constants of the discharge circuit are: (a) ...Lecture 5: Temperature Radiation - 2 hit(s)
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... soon as we focus it on the sensitive spot. With increasing tempera- ture, first the lowest of the visible frequencies appear and become visible as red light, and with still further increase of temperature gradually orange, yellow, green, blue, violet and ultra-violet rays appear and the color thus changes from red to orange, yellow, yellowish white and then white, the latter at that temperature where all the visible radiations are present in the same propor- tion as in daylight. With still further increase of temperat ...Lecture 9: Measurement Of Light And Radiation - 1 hit(s)
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... ion, as in an incandescent lamp, this method is the most exact. However, it can directly measure only the total radiation power. To measure the different parts of the radiation so as to determine separately the power in the visible, the ultra-red, and the ultra-violet range, the method of input and losses can be used to give the total radiation power, and, by bolometer or other means, the relative powers of the component radiations measured in a beam of light. From the total radiation and the ratio of its components, t ...