Which of the following is not a photoemissive cell?(a) high vacuum photocells(b) barrier layer cell(c) gas-filled photocell(d) photomultiplier tubesThis question was posed to me in homework.My question comes from Photoelectric Transducers topic in chapter Physiological Transducers of Biomedical Instrumentation

Which of the following is not a photoemissive cell?(a) high vacuum pho

1.	Which of the following is not a photoemissive cell?(a) high vacuum photocells(b) barrier layer cell(c) gas-filled photocell(d) photomultiplier tubesThis question was posed to me in homework.My question comes from Photoelectric Transducers topic in chapter Physiological Transducers of Biomedical Instrumentation
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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