Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Rank - Page 371: 45


A, C, B.

Work Step by Step

Shock waves are created when the source moves faster than the speed of a wave in the medium. The higher the speed of the source, the narrower the V shape. This is stated on page 367. In order of narrow shock wave to broad shock wave, the list goes A, C, B. An internet search for the term "Mach angle" shows that generally, the sine of the half-angle gives the ratio of the speed of sound to the speed of the plane.
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