A common characteristic of sound waves is that they

A. Are created by vibrations

B. Travel in straight lines toward the source

C. Travel fastest through empty space

D. Move at the speed of light

Answer;

A. Are created by vibrations

Explanation; Mechanical waves are waves which travel only through matter and involve the motion and vibration of particles of the matter they pass through. Sound waves are an example. Sound waves are longitudinal waves. Speed of sound is about 343 m/s (767 mi/h) in sea-level air at ordinary temperatures. Additionally, sound travels faster in liquids and solids than in gases.