Question: A zirconia-based ceramic has the spectral, hemispherical emissivity shown below and is being considered for use as the filament of a light bulb. (a) What

A zirconia-based ceramic has the spectral, hemispherical emissivity shown below and is being considered for use as the filament of a light bulb.

(a) What is the total, hemispherical emissivity of a zirconia fi lament operating at 3000 K?

(b) Using the spectral distribution provided in Problem 12.29, determine the total hemispherical emissivity of a tungsten filament at 3000 K and compare the result with that obtained for zirconia. For zirconia and tungsten operating at 3000 K in an evacuated bulb, what filament requires the larger power consumption?

(c) With respect to the production of visible radiation, which of the two filaments is the more efficient? Justify your answer quantitatively.

1.0 Zirconia 0.8 0.2 A (um) 0.7 0.4

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