Answer :

An optical pyrometer calibrated for an ideal black body radiation gives too low a value for temperature of a red-hot iron piece kept in the open. Black body radiation equation is given by E = σ (T4 - T04)


Where, E = Energy radiation


T = Temperature of optical pyrometer


To = Temperature of open space


σ = Constant


Hence, an increase in the temperature of open space reduces the radiation energy. When the same piece of iron is placed in a furnace, the radiation energy, E = σ T4.


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