The true statement about sound waves is: They vibrate the air.
Sound waves are mechanical waves that require a medium (like air, water, or solids) to travel, and they create vibrations in that medium.
To clarify the other statements:
- Sound waves do not move faster than light; light travels much faster in a vacuum.
- Sound waves actually move faster in water than in air due to the denser medium.
- Sound waves do not create wind; wind is the movement of air itself, but sound can be carried through moving air.