Answer
$u=14.6\frac{m}{s}$
Work Step by Step
We know that
$f^{\prime}=(\frac{1}{1-u/v})f$
This can be rearranged as:
$u=(1-\frac{f}{f^{\prime}})v$
We plug in the known values to obtain:
$u=(1-\frac{450}{470})(343)$
$u=14.6\frac{m}{s}$
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 493: 44
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