WAVES

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Across
  1. 2. another name for the crest of a wave
  2. 3. the top of a wave
  3. 6. the spread out section of a longitudinal wave
  4. 8. transverse waves oscillate in this direction
  5. 11. these can travel through a vacuum
  6. 12. a measure of the time taken for one full oscillation
  7. 14. the smallest angle for total internal reflection
  8. 17. these need a medium to travel through
  9. 19. the spreading out of white light into a rainbow
  10. 20. the bottom of a wave
  11. 21. when a wave spreads out due to going through a gap or around a barrier
  12. 23. when a wave bends due to entering a medium with different optical density
Down
  1. 1. longitudinal waves oscillate in this direction
  2. 4. occurs when the incident ray, travelling from glass to air, is larger than the critical angle
  3. 5. waves that oscillate perpendicular to their direction of energy transfer
  4. 7. sound waves are an example of this type of wave
  5. 9. the distance from the midpoint to the maximum point on a wave
  6. 10. the squashed up section of a longitudinal wave
  7. 13. a triangular block of glass used to spread light out into a rainbow
  8. 15. when a wave bounces back at the same angle
  9. 16. the distance it takes for a wave to repeat itself
  10. 18. a regular pattern of disturbance that can transfer energy from one position to another
  11. 22. the SI unit for frequency