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Doctors Medicines MCQs Q&A

  1. photocell
  2. photoemission cell
  3. photovoltaic cell
  4. photoconductive cell
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1 Answers

Option 4 : photoconductive cell

Photoconductive cell:

  • A photoelectric device in which the resistance of the metal is directly proportional to the light striking is known as a photo-conductive cell.
  • Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in light intensity.
  • The photoconductive effect is a process in which the conductivity of a semiconductor material changes according to the wavelength and intensity of the radiation.

Photocell: 

  • A photo cell is made up of a resistor that produces electrical energy depending upon the amount of light incident on photosensitive plates.
  • As more light hits the plates, the resistance changes, turning the light on and off.

Photovoltaic cell:

  • A photovoltaic cell, also known as a solar cell, is an electronic component that generates electricity when exposed to photons, or particles of light.

Photoemission cell:

  • A photoemissive cell, commonly known as a phototube, makes use of the photoelectric effect, the phenomenon whereby light-sensitive surfaces give off electrons when struck by light.
  • It consists of a photosensitive cathode(negative) from which electrons are emitted when hit by light. It also contains an anode(positive) that attracts these free electrons. 
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