6.6 electromagnetic waves

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electromagnetic spectrum, sound vs light,

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6.6 electromagnetic waves

  1. 1. 6.6 Electromagnetic Waves 29 January 2015 Think about: • How well behaved you are • How good you are at science • How much you like chocolate hob nobs
  2. 2. Aims • Describe visible light as part of the electromagnetic spectrum • State other types of radiation
  3. 3. Electromagnetic waves
  4. 4. Travel through empty space
  5. 5. Travel at 300 000 km/s
  6. 6. Transverse waves
  7. 7. They transfer energy
  8. 8. Light vs Sound Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium
  9. 9. Light vs Sound Example of wave LIGHT SOUND Type of wave Transverse Longitudinal Speed in air / km/s 300 000 340 Material of medium No material required Solid, liquid, gas
  10. 10. Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium
  11. 11. Electromagnetic radiation actually comes in packets or lumps. I call these packets ‘quanta’. A quanta of light is called a photon. Nobel prize please…
  12. 12. The higher the frequency, the more energy the photon has
  13. 13. Intensity Energy of each photon Number of photons arriving each second
  14. 14. The electromagnetic spectrum
  15. 15. Radio waves
  16. 16. Radiowaves • Communications: TV, mobile phones, local radio, police
  17. 17. Microwaves
  18. 18. Microwaves • Microwaves ovens, communicating with satellites, RADAR
  19. 19. Infrared
  20. 20. Infra-red • Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms
  21. 21. Light
  22. 22. Ultraviolet
  23. 23. UV • Produce vitamin D in our skin, suntan, skin cancer
  24. 24. X-rays
  25. 25. X-rays • X-rays (bones, teeth), check welds and joints, food
  26. 26. Gamma rays
  27. 27. Gamma rays • Make Hulks, sterilise food and utensils, tracers, radiotherapy
  28. 28. RECALL THE DETRIMENTAL EFFECTS OF EXCESSIVE EXPOSURE OF THE HUMAN BODY TO ELECTROMAGNETIC WAVES 3.13
  29. 29. Make an EM spectrum booklet Guest starring Mr. Simon Porter
  30. 30. The EM spectrum • You now have seven sections to fill in with information regarding the seven types of electromagnetic radiation • Include uses, dangers, detectors, examples and origins if you can • The better you make it the better it will help your revision

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