A) Platinum thermometer
B) Gas thermometer
C) Pyrometer
D) Vapour pressure thermometer
Correct Answer: C
Solution :
Pyrometers are the devices used to measure-the temperature by measuring the intensity of radiations received from the body. They are based on the fact that the amount of radiation emitted from a body per unit area per second is directly proportional to the fourth power of temperature (Stefan's law). These can be used to measure temperature ranging from \[{{800}^{o}}C\] to \[{{6000}^{o}}C\].
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