Which one of the following Thermometers is known as pyromete

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Which one of the following Thermometers is known as pyrometer?

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[UPPSC 2016 P1]

A Thermo-electric thermometers

थर्मो-इलेक्ट्रिक थर्मामीटर

B Radiation thermometers

विकिरण थर्मामीटर

C Gas thermometers

गैस थर्मामीटर

D Liquid thermometers

तरल थर्मामीटर