Sally M. Walker 
Investigating Sound [PDF ebook] 

People, animals, machines, and wind all make sounds. But have you ever seen how sound waves move? Or made a sound wave bounce? Now you can! Explore sound with the fun experiments you’ll find in this book. As part of the Searchlight Books(TM) collection, this series sheds light on a key science question-How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!