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      Question

      Which of the following devices can be used to detect

      radiant heat?
      A Liquid thermometer Correct Answer Incorrect Answer
      B Six's maximum and minimum thermometer Correct Answer Incorrect Answer
      C Constant volume air thermometer Correct Answer Incorrect Answer
      D Thermopile Correct Answer Incorrect Answer

      Solution

      Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermocouples near the ground measures radiant energy.

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