waves

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Across
  1. 4. of a wave tells how many cycles occur in an amount of time
  2. 7. is a measure of how well a sound can be heard
  3. 8. is a reflect sound wave
  4. 10. depends on the properties of medium
  5. 12. is the distance from any point on a wave to an identical on the next wave
  6. 14. is a disturbance in electric and magnetic field
  7. 15. a material through which a wave travels
  8. 17. is the time required for one cycle
  9. 18. wave the requires a medium
  10. 19. particles move perpendicularly to the direction the wave travels
Down
  1. 1. effect is a change in the observed frequency of a wave
  2. 2. happens when two or more waves overlap and combine to form one wave
  3. 3. animals that use of echoes or reflected sound waves to find object
  4. 5. particles move back and forth in the same direction that the travels or parallel to the wave
  5. 6. happens what a sound wave matches the nature frequency of an object and causes the object to vibrate
  6. 9. the most common unit used to express loundness
  7. 11. is a measure of how far the particles in the medium move away from their normal rest position
  8. 13. is how high or low you think a sound is
  9. 16. is a system that used sound wave to determine the location of object or to communicate
  10. 20. a disturbance that transfers energy from one place to another