Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 22 - Electromagnetic Waves - Misconceptual Questions: 7

Answer

Choice D.

Work Step by Step

Moving twice the distance from the sun means that its power is evenly distributed over an area that is 4x greater. In other words, radiation intensity scales as the inverse square of the distance. Doubling the sun-Earth distance decreases the radiation intensity to one-fourth its initial value.
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