Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 20 - Think and Explain - Page 389-390: 54


The sound wave from a traditional starter's pistol, traveling through air, is heard first by the runner who is closest. To be fair to all runners at the Olympics, the starting signal is transmitted electrically to speakers located right behind each runner. The electrical signal travels hundreds of thousands times faster than sound travels in air, ensuring that all runners begin simultaneously.
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