A room window (consisting of a vertical sheet of plane glass) is exposed to direct sunshine at a strength of 1000 W/m2. The window is pointing due south, while the sun is in the southwest, 30° above the horizon. Estimate the amount of solar energy in W/m2 reflected by the window. Assume glass to be gray with ρ(reflectivity) = 0.08.

A room window (consisting of a vertical sheet of plane glass) is expos

1.	A room window (consisting of a vertical sheet of plane glass) is exposed to direct sunshine at a strength of 1000 W/m2. The window is pointing due south, while the sun is in the southwest, 30° above the horizon. Estimate the amount of solar energy in W/m2 reflected by the window. Assume glass to be gray with ρ(reflectivity) = 0.08.
A.	49
B.	490
C.	612.4
D.	61.2
Answer» B. 490

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