Echoes

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Across
  1. 3. The object or action that produces sound.
  2. 8. The movement of energy from one particle to another.
  3. 9. How fast sound moves through a medium.
  4. 11. A tiny piece of matter that moves when sound passes through.
  5. 12. A repeated back-and-forth movement of particles.
  6. 14. The gap between the original sound and the reflected sound.
  7. 15. To move from one place to another.
  8. 16. The bouncing back of a wave from a surface.
  9. 17. The boundary of an object that a wave can hit.
  10. 18. A surface that reflects most sound waves.
  11. 19. To bounce back from a surface.
  12. 20. A material through which sound travels, such as air.
Down
  1. 1. To push particles closer together.
  2. 2. The person or device that hears the sound.
  3. 4. Repeated reflections of sound that blend together in a room.
  4. 5. A wave that carries sound energy through vibrations of particles.
  5. 6. A reflected sound heard again after it bounces off a surface.
  6. 7. A form of energy that travels through a medium and can be heard.
  7. 9. A surface that absorbs much of the sound energy.
  8. 10. The length between two points.
  9. 13. The part of a sound wave where particles are spread apart.