College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 14 - Sound - Learning Path Questions and Exercises - Exercises - Page 523: 10

Answer

The atomic mass of copper is 63.5g/mol and that of zinc is 65.3 g/mol. The speed of sound in solids is inversely proportional to molecular mass of the substance. When Zinc is added to copper, the average molecular mass of the mixture increases, which leads to decrease in the speed of sound in the brass as that of copper.

Work Step by Step

The atomic mass of copper is 63.5g/mol and that of zinc is 65.3 g/mol. The speed of sound in solids is inversely proportional to molecular mass of the substance. When Zinc is added to copper, the average molecular mass of the mixture increases, which leads to decrease in the speed of sound in the brass as that of copper.
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