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P9 electromagnetic spectrum

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P9 electromagnetic spectrum

  1. 1. Electromagnetic spectrum
  2. 2. Visible light
  3. 3. Visible light λ ≈ 700 nm λ ≈ 420 nm
  4. 4. Ultraviolet waves λ ≈ 700 - 420 nm
  5. 5. Ultraviolet waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm
  6. 6. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm
  7. 7. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm
  8. 8. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm
  9. 9. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.00001 nm
  10. 10. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.00001 nm
  11. 11. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m
  12. 12. Microwaves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m
  13. 13. Microwaves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m
  14. 14. Radio waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m
  15. 15. Radio waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m
  16. 16. Electromagnetic spectrum λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m
  17. 17. Electromagnetic spectrum Long Wavelength Short Wavelength
  18. 18. Electromagnetic spectrum Long Wavelength Short Wavelength Low Frequency High Frequency
  19. 19. What do they all have in common? λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 10 -12 - 10 -14 m λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m
  20. 20. What do they all have in common? <ul><li>They can travel in a vacuum </li></ul><ul><li>They travel at 3 x 10 8 m.s -1 in a vacuum (the speed of light ) </li></ul><ul><li>They are transverse </li></ul><ul><li>They are electromagnetic waves (electric and magnetic fields at right angles to each oscillating perpendicularly to the direction of energy transfer) </li></ul>
  21. 21. What else do you need to know?
  22. 22. Electromagnetic spectrum Long Wavelength Short Wavelength Low Frequency High Frequency
  23. 23. Uses of microwaves <ul><li>Satellite TV and cellular phones </li></ul>
  24. 24. Uses of Infrared waves <ul><li>Remote controls for TVs and intruder alarms </li></ul>
  25. 25. Uses of X-rays <ul><li>Medicine and security </li></ul>
  26. 26. Dangers of microwaves and X-rays
  27. 27. You need to know the speed of light (c) <ul><li>300 000 000 m/s </li></ul><ul><li>3 x 10 8 m/s </li></ul>

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