Question: A small metal object, initially at T, = 1000 K, is cooled by radiation in a low-temperature vacuum chamber. One of two thin coatings

A small metal object, initially at T, = 1000 K, is cooled

A small metal object, initially at T, = 1000 K, is cooled by radiation in a low-temperature vacuum chamber. One of two thin coatings can be applied to the object so that spectral hemispherical emissivities vary with wavelength as shown. For which coating will the object most rapidly reach a temperature of T = 500 K? 1.0 Coating B Coating A * 0.5 100 10 2 (um)

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