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Which of the following devices can be used to detect radiant heat ?
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- Liquid thermometer
- Six’s maximum and minimum thermometer
- Constant volume air thermometer
- Thermopile
- Liquid thermometer
Correct Option: D
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.
