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(i) A total radiation thermometer (calibrated with a black body) reads a brightness temperature of 427...

(i) A total radiation thermometer (calibrated with a black body) reads a brightness temperature of 427 degrees celcius on a section of an opaque reactor wall which has a total grey emissivity, of 0.8. Write the formula allowing the determination of its true temperature, Tt1, and calculate Tt1 to the nearest degree °C. Determine the relative error (in %) made when neglecting the emissivity correction.

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