ELECTROMAGNETIC RADIATION

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Across
  1. 3. – Unit for frequency
  2. 5. – Band of colours or EM types arranged by wavelength
  3. 6. – Object that splits white light into a spectrum
  4. 7. – What all EM waves travel at in a vacuum (5,5)
  5. 9. – Layer in atmosphere that absorbs ultraviolet
  6. 10. – Colour that comes just before green in the spectrum
  7. 11. – Electromagnetic wave with lowest frequency (5,4)
  8. 13. – Used to sterilise medical equipment
  9. 18. – Waves that don’t need particles to travel
  10. 20. – Scientist who discovered that white light is made of many colours
  11. 21. – Longest wavelength in the visible spectrum
  12. 22. – Power of ten in the speed of light: 3 × 10^? m/s
  13. 23. – Property that decreases as wavelength increases
Down
  1. 1. – Measurement of how many waves pass each second
  2. 2. – Highest energy electromagnetic radiation
  3. 3. – Astronomer who discovered infrared radiation
  4. 4. – Waves that vibrate at right angles to their direction like EM waves
  5. 7. – Symbol for wavelength in equations (Greek letter)
  6. 8. – Light with frequency just higher than visible light
  7. 12. – Medium where EM waves travel fastest
  8. 14. – Type of EM wave used in ovens and radar
  9. 15. – Type of wave used in hospital scans (1,3)
  10. 16. – Number of colours in the visible spectrum
  11. 17. – Colour with the shortest visible wavelength
  12. 19. – Type of EM wave used in night vision and TV remotes