Working principle of disappearing filament type optical pyrometer is based on the ________________?
Correct answer: B. Wien's law
- A. Seebeck effect
- B. Wien's law
- C. Kirchoff's law
- D. Peltier effect
Explanation
A disappearing-filament optical pyrometer compares the brightness of a heated filament with the radiation from the hot body, using the temperature dependence of blackbody radiation expressed by Wien's law. Seebeck and Peltier effects are thermoelectric phenomena, not optical-pyrometer principles.
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