## Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson

# Chapter 14 - Exercises and Problems - Page 263: 42

#### Answer

$399.8\ Hz$

#### Work Step by Step

We know that the speed of sound is 343 meters per second. Considering the speed of the car, we find that the speed of the sound is effectively: $f = 380 \times \frac{1}{1-\frac{17}{343}}= 399.8\ Hz$

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