Answer
$149Hz$
Work Step by Step
We can find the frequency heard by the passenger in the train as
$f^{\prime}=(1+\frac{u}{v})f$
We plug in the known values to obtain:
$f^{\prime}=(1+\frac{31.8}{343})(136Hz)=149Hz$
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: 46
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