Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 16 - Think and Explain - Page 317-318: 78

Answer

In the summer, too much sunlight might be entering the greenhouse. Whitewash is applied to reflect some sunlight, not letting it enter the greenhouse.
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