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Which of the following is a photoemissive cell?

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in Biomedical Instrumentation by (76.6k points)
Which of the following is a photoemissive cell?

(a) photomultiplier tubes

(b) barrier layer cell

(c) galvanic cell

(d) rochell-salt cell

This question was posed to me in an international level competition.

Query is from Photoelectric Transducers in division Physiological Transducers of Biomedical Instrumentation

1 Answer

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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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