Question

When sound travels through air, the air particles _________

• A. vibrate along the direction of wave propagation
• B. vibrate but not in any fixed direction
• C. vibrate perpendicular to the direction of wave propagation
• D. do not vibrate

Answer 1

The correct option is A vibrate along the direction of wave propagation

Sound waves travelling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air, the air particles vibrate along the direction of wave propagation.