Energy Crossword Puzzle

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Across
  1. 3. The low part of a wave
  2. 4. The bouncing of light off a surface
  3. 7. The distance between crests
  4. 9. How high or low a sound is
  5. 11. The bending of light around edges of objects
  6. 14. Stored energy
  7. 15. Material that allows most light through it
  8. 17. The ability to cause change in matter
  9. 18. The amount of times something occurs
  10. 20. Energy of heat
Down
  1. 1. A measurement of the loudness of sounds
  2. 2. Material that allows some light through it
  3. 5. The high part of a wave
  4. 6. The bending of light between object's surfaces
  5. 8. The energy of motion
  6. 10. Material that doesn't allow light through it
  7. 12. The energy of the Sun
  8. 13. A disturbance that carries energy through matter
  9. 16. Energy produced by nuclear reactions
  10. 19. The distance from the crest to the trough