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The photoelectric effect is the basis of operation of such devices as the television
camera, photographic light meters, image in- tensifiers for telescopes, cells for
the conversion of solar energy, and detectors for all kinds of spectrometry.
Photoconductors show a number of secondary effects, a few of which may be
mentioned here. Sensitive photoconductors may have response times measured
in hours or days when operated at extremely high resistivities. The photocurrent ...
By the end of the 18th century, in England, Joseph Priestley had noted that no
electric effect was exhibited inside an electrified hollow metal container and had
brilliantly inferred from this similarity that the inverse- square law (of gravity) must
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review