Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Discuss: 93

Answer

It does not imply that the airplane is supersonic.

Work Step by Step

The speed of light is almost a million times larger than the speed of sound. As a result, whether a plane is supersonic or not, sound always appears to come from a point in the sky behind where you see the plane.
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