Publisher's Synopsis
Excerpt from Instruments and Methods Used in Radiometry, Vol. 3: The Photo-Electric Cell and Other Selective Radiometers
Many substances are light sensitive, for example, copper oxide, sulphides of antimony, silver, etc. The best-known example is crystalline selenium, which will'be discussed presently.
Group III includes substances which, when charged to a nega tive potential (in an evacuated chamber), lose their charge when exposed to light, especially violet and ultra-violet rays. When used in this manner they are commonly called photoelectric cells. The emission of electrons is. A surface phenomenon which is easily affected by oxidation of the surface.
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