Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 14 - Waves and Sound - Problems and Conceptual Exercises - Page 494: 67

Answer

Choice III

Work Step by Step

The frequency of an air column is equal to $$f_n=\frac{nv}{2L}$$ As the length increases, the frequency decreases. Therefore, as less pop is in the bottle, the longer column of air and therefore lower frequency.
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