1.

Which of the following is a photoemissive cell?(a) photomultiplier tubes(b) barrier layer cell(c) galvanic cell(d) rochell-salt cell

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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