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Q: A common detector employed to detect IR radiation is the-
  • A. Photovoltanic cell
  • B. Photomultiplier
  • C. Crystal
  • D. Thermocouple
Correct Answer: Option D - The common detector for infrared (IR) radiation is typically thermocouple. It measures temperature changes when exposed to IR radiation, making it a reliable choice for this purpose.
D. The common detector for infrared (IR) radiation is typically thermocouple. It measures temperature changes when exposed to IR radiation, making it a reliable choice for this purpose.

Explanations:

The common detector for infrared (IR) radiation is typically thermocouple. It measures temperature changes when exposed to IR radiation, making it a reliable choice for this purpose.