Note

• Waves transfer energy from one place to another, without transferring material.
• Sound waves are caused by the vibration of particles.
• Sound waves cannot be transferred through a vacuum, as vacuums do not contain particles
• Sound waves are longitudinal waves. Their vibrations occur in the same direction as the direction of travel.
• Sound waves can only travel through a solid, liquid or gas
• Diagram:-

  A) Movement of energy

  B) Movement of hand and spring sections