Which of the following is a photoemissive cell?(a) photomultiplier tubes(b) barrier layer cell(c) galvanic cell(d) rochell-salt cellThis question was posed to me in an international level competition.Query is from Photoelectric Transducers in division Physiological Transducers of Biomedical Instrumentation

Which of the following is a photoemissive cell?(a) photomultiplier tub

1.	Which of the following is a photoemissive cell?(a) photomultiplier tubes(b) barrier layer cell(c) galvanic cell(d) rochell-salt cellThis question was posed to me in an international level competition.Query is from Photoelectric Transducers in division Physiological Transducers of Biomedical Instrumentation
Answer» Correct answer is (a) photomultiplier tubes To explain I would say: Photomultiplier tubes are photoemissive cells.These type to cells do require an external power supply to provide a sufficient potential DIFFERENCE between the ELECTRODES to facilitate the flow of electrons generated at the photosensitive CATHODE surface. Also, amplifier CIRCUITS are invariably employed for the amplification of this CURRENT.

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