Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Rank - Page 178-179: 46

Answer

Light, brightest to dimmest: C, B, A.

Work Step by Step

Situation B is dimmer than situation C because we are twice as far away. The inverse-square relation tells us the light from one candle would be 1/4 as dim, and having 2 candles doesn't compensate. Situation B has half the intensity of situation C. This is discussed on pages 164-165. Situation A is dimmer than situation C because we are three times as far away. The inverse-square relation tells us the light from one candle would be 1/9 as dim at that distance, so having 3 candles doesn't compensate. Situation A has one-third the intensity of situation C. This is discussed on pages 164-165.
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