all. All rights reserved. Properties of Sound Waves (pages 514-515) 1. Circle the letter of each sentence that is true about sound. a. Many behaviors of sound can be explained using a few properties. b. Sound waves are compressions and rarefactions that travel through a medium . c. Sound waves usually travel more slowly in solids than in gases. d. The speed of sound in air is about 30 meters per second. conerties.