The Electromagnetic Spectrum

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Across
  1. 3. color that has the longest wavelength
  2. 5. used in treating illnesses and making images
  3. 8. used to broadcast communication signals
  4. 11. form of energy given off by the sun
  5. 12. the colors of the EM spectrum seen by humans
  6. 14. amount given off depends on temperature
  7. 15. used in heating foods and cellular phones
  8. 17. color that has the shortest wavelength
  9. 19. transfer of energy as electromagnetic (EM) waves
  10. 20. shorter wavelength than violet light
  11. 22. can cause damage to skin and eyes
  12. 23. what we perceive when we see all wavelengths
Down
  1. 1. southern lights
  2. 2. northern lights
  3. 4. travels at 300,000,000 m/s
  4. 6. beyond red; can be seen by some animals
  5. 7. longer wavelength than red light
  6. 9. three color ranges of light seen by the eye
  7. 10. can pass through most tissue but absorbed by bones
  8. 13. small dots of red, green, and blue light
  9. 16. range of frequencies in EM waves
  10. 18. tool used to split colors by wavelength
  11. 21. beautiful display of special light near the poles