The surface in Prob. 21€“120 receives solar radiation at a rate of 470 W/m². Determine the solar absorptivity of the surface and the rate of absorption of solar radiation.

In Prob

The spectral absorptivity of an opaque surface is as shown on the graph. Determine the absorptivity of the surface for radiation emitted by a source at

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0.8 0.1 2, um 0.3 1.2