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Question

The instrument used to measure the temperature of the source from its thermal radiation is:

A
hydrometer
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B
barometer
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C
thermopile
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D
pyrometer
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Solution

The correct option is C thermopile
Thermopile is a combination of thermocouple which generates electrical energy when one end is kept at higher temperature with respect to the other end. It is helpful in measuring the temperature of a hot and radiating body.

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