A radiation detector has an aperture of area Ad 106 m2 and

Chapter , Problem 12.82

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A radiation detector has an aperture of area Ad 106 m2 and is positioned at a distance of r 1 m from a surface of area As 104 m2 . The angle formed by the normal to the detector and the surface normal is 30 . The surface is at 500 K and is opaque, diffuse, and gray with an emissivity of 0.7. If the surface irradiation is 1500 W/m2 , what is the rate at which the detector intercepts radiation from the surface? 12

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