The Amount of Sunshine Illuminating a Wall of a Building

question 59

Multiple Choice

The amount of sunshine illuminating a wall of a building can greatly affect the energy efficiency of the building. The solar radiation striking a vertical wall that faces east is given by the formula where R ₀ is the maximum solar radiation possible, is the angle that the sun makes with the horizontal, and is the direction of the sun in the sky, with = 90 ^o when the sun is in the east and = 0 ^o when the sun is in the south. What percentage of R ₀ is striking the wall when is equal to 60 ^o and the sun is in the southeast?
Round the answer to the nearest integer.

• A)40 %
• B)59 %
• C)20 %
• D)25 %
• E)35 %

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