Light and Waves

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Across
  1. 2. The distance from the middle to the top or bottom of a wave
  2. 6. The highest point of a wave
  3. 11. Reflection from a smooth surface
  4. 12. To give out
  5. 13. The number of complete waves or vibrations produced in one second and is measured in Hertz
Down
  1. 1. Reflection from a rough surface
  2. 3. The lowest point of a wave
  3. 4. The distance between two identical points on the wave
  4. 5. Gives out light
  5. 7. The oscillations are parallel to the direction of the wave
  6. 8. Something that moves backwards and forwards
  7. 9. The change in direction of a ray or wave as a result of its change in speed
  8. 10. The vibrations are at right angles to the direction the wave moves