Answer
$(B)\ 2.3m$
Work Step by Step
We can find the required length of the air passages as
$L=\frac{v}{2f_1}$
We plug in the known values to obtain:
$L=\frac{343}{2(74)}=2.3m$
Physics Technology Update (4th Edition)
by Walker, James S.
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 498: 119
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