Answer
(b) the closed pipe.
Work Step by Step
Fundamental frequency of an open pipe is
$f_{open}=\frac{v}{2L}$
Fundamental frequency of a closed pipe is
$f_{open}=\frac{v}{4L}$
So, the lowest natural frequency is that of the closed pipe (b)
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 14 - Sound - Learning Path Questions and Exercises - Multiple Choice Questions - Page 522: 14
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