Electromagnetic spectrum

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Across
  1. 2. how people measure waves
  2. 3. doctors use these
  3. 6. only light we can see
  4. 7. think start of the rainbow
  5. 8. smallest waves
  6. 9. title of the crossword
Down
  1. 1. size of molecules
  2. 4. used for radar
  3. 5. used for heating food