Consider a large furnace with opaque, diffuse, gray walls at 3000 K having an emissivity of 0.85. A small, diffuse, spectrally selective object in the furnace is maintained at 300 K. For the specified points on the furnace wall (A) and the object (B), indicate values for ?, ?, E, G, and J.

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Furnace, T,= 3000 K Point A E; = 0.85 1.0 0.8 Object, 7,= 300 K * 0.6 a 0.4 0.2 Point B A (um)