Topical Questions
These questions are keyed to the major topics in this chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.
On a sunny day, solar energy reaches Earth at a rate of 4.0 J min-1 cm-2. Suppose a house has a square, flat roof of dimensions 12 m by 12 m. How much solar energy reaches this roof in 1.0 h? (Note: This is why roofs painted with light-reflecting paint keep buildings cooler than black, unpainted roofs. The painted roofs reflect most of this energy rather than absorb it.)
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