CROSSWORD PUZZLE

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Across
  1. 4. most ____ waves are invisible to the eye but detectable
  2. 7. sometimes called "heat rays"
  3. 9. the colour with the longest wavelength in the visible spectrum
  4. 10. rays carry the highest amount of energy
  5. 11. infrared and UV rays lie at the end of the ______ spectrum
  6. 13. property that spells the difference between infrared and UV radiation
Down
  1. 1. the acronym of ranging detection radio
  2. 2. UV radiation is used for _____ water
  3. 3. most EM waves are invisible to the eye but ______
  4. 4. microwaves can penetrate the atmosphere of the _____
  5. 5. type of EM waves used in radars
  6. 6. electric field and magnetic ____ produce electromagnetic wave
  7. 8. UV _____ carries more energy than the others
  8. 12. all x-rays are dangerous because they can damage healthy living ____ of the body