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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