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6.6 electromagnetic waves

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electromagnetic spectrum, sound vs light,

electromagnetic spectrum, sound vs light,

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    6.6 electromagnetic waves 6.6 electromagnetic waves Presentation Transcript

    • 31 October 2010
      6.6 Electromagnetic Waves
      Think about:
      • How well behaved you are
      • How good you are at science
      • How much you like chocolate hob nobs
    • Aims
      Describe visible light as part of the electromagnetic spectrum
      State other types of radiation
    • Electromagnetic waves
    • Travel through empty space
    • Travel at 300 000 km/s
    • Transverse waves
    • They transfer energy
    • Light vs Sound
    • Light vs Sound
    • Electromagnetic radiation actually comes in packets or lumps. I call these packets ‘quanta’. A quanta of light is called a photon. Nobel prize please…
    • The higher the frequency, the more energy the photon has
    • Intensity
      Energy of each photon
      Number of photons arriving each second
    • The electromagnetic spectrum
    • Radio waves
      Accelerated electrons
    • Radiowaves
      Communications: TV, mobile phones, local radio, police
    • Microwaves
      Molecular transitions
    • Microwaves
      Microwaves ovens, communicating with satellites, RADAR
    • Infrared
      Molecular transitions
    • Infra-red
      Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms
    • Light
      Atomic transitions and electron acceleration
    • Ultraviolet
      Atomic transitions
    • UV
      Produce vitamin D in our skin, suntan, skin cancer
    • X-rays
      Electron transitions and collisions
    • X-rays
      X-rays (bones, teeth), check welds and joints, food
    • Gamma rays
      Nuclei transitions and annihilation
    • Gamma rays
      Make Hulks, sterilise food and utensils, tracers, radiotherapy
    • recall the detrimental effects of excessive exposure of the human body to electromagnetic waves
      3.13
    • Make an EM spectrum booklet
      Guest starring Mr. Simon Porter
    • 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