To measure temperature of more than 3000°C, the most suitable thermometer is :
MH SET - 2020, SET Exam - 2020,
Answer: C
The most suitable is the radiation pyrometer.
A radiation pyrometer measures temperature from the thermal radiation a hot body emits, using the Stefan-Boltzmann or Planck laws. It does not touch the body, so it has no upper limit set by the melting or failure of a sensor, and it is used for furnaces, molten metals and similar temperatures above 3000 °C.
A platinum resistance thermometer is limited to roughly 1000 °C or so, common thermocouples to well under 2000 °C (refractory ones to about 2300 °C), and a gas thermometer's bulb softens or melts long before 3000 °C.
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