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Which of the following devices can be used to detect radiant...

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Physics
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Which of the following devices can be used to detect radiant heat ?

Answer & Solution
Correct Answer: 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.
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