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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 | |
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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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