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Q. |
Which of the following devices can be used to detect radiant heat? |
A. | Liquid thermometer |
B. | Six's maximum and minimum thermometer |
C. | Constant volume air thermometer |
D. | Thermopile |
Answer» D. Thermopile | |
Explanation: 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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