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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