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Which of the following is not a photoemissive cell?(a) high vacuum photocells(b) barrier layer cell(c) gas-filled photocell(d) photomultiplier tubes |
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Answer» Right answer is (c) gas-filled photocell The best explanation: Barrier layer cells are photovoltaic cells. They consist of a semiconducting substance, which is generally selenium deposited on a metal base which may be iron and which acts as one of the electrodes. Photovoltaic cells are very robust in construction, need no external electrical supply and produce a photocurrent sometimes stronger than other photosensitive elements. |
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