University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 16 - Sound and Hearing - Problems - Discussion Questions - Page 537: Q16.6

Answer

Notes produced by the windpipe increase in pitch when a person breathes helium.

Work Step by Step

Equation 16.22 gives the frequencies of a stopped pipe, open at one end, $f_n=\frac{nv}{4L}$. As seen in Table 16.1, the speed of sound is much greater in helium than in air. Because the speed of sound v increases, the pitch of the voice increases.
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