science

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Across
  1. 4. a wave that requires a medium to travel
  2. 6. what frequency is expressed in
  3. 9. a measure of how far the particles in the medium move from their normal rest position
  4. 11. particles move back and forth in the same direction that the wave travels
  5. 13. happens when a sound wave matches a natural frequency of an object
  6. 14. the speed at which a wave travels
  7. 17. the time required for one cycle of waves
  8. 20. tells how many waves occur in an amount of time
Down
  1. 1. sound waves that have frequencies greater than 20,000 hertz
  2. 2. unit used to express loudness
  3. 3. a disturbance in electric and magnetic fields
  4. 5. uses of echoes to find objects
  5. 7. a disturbance that transfers energy from one place to another
  6. 8. longitudinal wave that is caused by vibrations and travels through a medium
  7. 10. particles move perpendicularly to the direction the wave travels
  8. 12. distance from any point on a wave to an identical point on the next wave
  9. 15. the material through which a wave travels
  10. 16. measure of how well a sound can be heard
  11. 18. a reflected sound wave
  12. 19. how high or low you think a sound is