Topic 5 Electromagnetic spectrums

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    • Electromagnetic waves transfer energy from source to an absorber
      all waves in Electromagnetic spectrum are transverse
    • The waves are shown in order from longest to shortest wavelength
      The waves also increase in frequency and energy along the spectrum
    • Rich Men In Vegas Use Xray Glasses
      Radiowaves
      Microwave
      Infrared
      Visible light
      Ultraviolet
      X-ray
      Gamma rays
    • The waves get more dangerous down the spectrum
    • Visible light
      • Has its own spectrum
      • Red(bigger wavelength)
      • Orange
      • Yellow
      • Green
      • Blue
      • Indigo
      • Violet(shorter wavelength)
    • The only part of electromagnetic spectrum humans can see is visible light
    • Electromagnetic waves can be absorbed, transmitted,reflected or refracted but it depends on there wavelength
    • Electromagnetic spectrum is continuous
    • In vaccum all electromagnet spectrums travel at 300,000,000 m/s
      Electromagnetic waves will travel at slower velocities in denser materials
    • When electromagnetic waves enter new material they can be refracted and change direction
    • Radio waves can be produced by or can themselves induce oscillations in electrical circuits
    • How do microwaves work
      • Water molecules in food absorb microwaves making them vibrate and heat up
    • Infrared,visible light and x-rays are generated by change in the arrangement of electrons in atoms
      -can take more energy to generate x-rays
    • Gamma rays come from changes in nuclei of atom
    • Electromagnetic radiation can also cause changes in atoms when absorbed
      • E.g. high frequency electromagnetic radiation such as ultraviolet, x-rays and Gamma rays cause ionization(atoms lose electrons and become ions)