Waves and Sound

12345678910111213141516171819202122
Across
  1. 6. The distance between two successive crests of a wave
  2. 7. This occurs when a wave bends around an object
  3. 9. The lowest point on a wave
  4. 12. A wave that contains an electric and a magnetic field and can travel through a vacuum
  5. 14. The maximum displacement of a wave from its resting position.
  6. 15. A wave that must travel through some sort of matter - it cannot travel through a vacuum like outer space
  7. 18. A measure of how fast a wave is moving
  8. 19. The unit for frequency
  9. 21. A wave that has rarefactions and compressions
  10. 22. The bending of a wave due to a change in speed as it enters a new medium
Down
  1. 1. A unit used to measure the intensity of a sound
  2. 2. A device that uses the reflection of sound waves to locate objects or create images
  3. 3. A wave with a crest and trough
  4. 4. The reflection of a sound wave from a surface back to the listener
  5. 5. The number of times per second that a wave cycles
  6. 8. The highest point of a wave
  7. 10. The tendence of a system to oscillate (vibrate) with greater amplitude at certain frequencies
  8. 11. How high or how low something sounds
  9. 13. This occurs when a wave bounces off a boundary and changes direction
  10. 16. This occurs when one wave encounters another
  11. 17. Sound travels fastest in this type of medium
  12. 18. A longitudinal wave caused by a vibration which we can hear
  13. 20. The matter that a wave travels through