EMS and Properties of Waves

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Across
  1. 3. Only part of the electromagnetic spectrum that human eyes can detect
  2. 7. The main natural source of all electromagnetic waves that reach Earth
  3. 10. The substance through which some waves travel (like air or water)
  4. 11. A form of electromagnetic radiation that lets us see
  5. 13. Distance between two corresponding points on a wave (such as crest to crest)
  6. 14. Type of radiation you can feel as heat but can't see
  7. 16. The unit used to measure frequency
  8. 18. Visible light colour with the longest wavelength
  9. 20. Type of wave used for cooking food and Wi-Fi signals
Down
  1. 1. The highest point of a wave
  2. 2. A tool that lets you split white light into its different colours
  3. 3. Where electromagnetic waves can travel even with no matter present
  4. 4. The complete range of electromagnetic waves arranged by wavelength or frequency
  5. 5. The lowest point of a wave
  6. 6. Shortest wavelength and highest energy radiation
  7. 8. Height of a wave from its rest position; shows the energy of the wave
  8. 9. Radiation that causes sunburns and helps make vitamin D
  9. 12. What all waves transfer from one place to another
  10. 15. Layer in Earths atmosphere that absorbs most ultraviolet radiation
  11. 17. Number of waves that pass a point in one second
  12. 18. Longest wavelength on the electromagnetic spectrum
  13. 19. Used in hospitals to see bones inside the body