Waves

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Across
  1. 2. this increases if the frequency of the sound increases
  2. 6. vibration that travels through a substance
  3. 7. the change of direction of a light ray when it passes across a boundary between two transparent substances
  4. 9. electric and magnetic disturbances that transfer energy
  5. 13. angle between the reflected ray and the normal
  6. 15. wave in which the vibration is perpendicular to the direction of energy transfer
  7. 17. waves in which the vibrations are parallel to the direction of energy transfer
  8. 18. the angle between the incident ray and the normal
Down
  1. 1. sound wave at a frequency greater than 20 000Hz
  2. 3. height of a wave crest or trough of a transverse wave
  3. 4. the spreading of waves when they pass through a gap or around the edges of an obstacle
  4. 5. reflection of sound that can be heard
  5. 8. at right angles
  6. 10. stretched apart
  7. 11. the distance from one wave crest to another
  8. 12. squeezing together
  9. 14. the number of wave crests passing a fixed point every second
  10. 16. distance moved / time taken