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Waves of the Electromagnetic Spectrum

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Waves of the Electromagnetic Spectrum Magnetic Field Electric Field Producing EM waves Electric field causes magnetic field to vibrate and magnetic field causes ... – PowerPoint PPT presentation

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Title: Waves of the Electromagnetic Spectrum


1
Waves of the Electromagnetic Spectrum
2
Producing EM waves
Electric Field
Magnetic Field
Electric field causes magnetic field to vibrate
and magnetic field causes electric field to
vibrate. - Perpendicular to each other
EM radiation the energy that is transferred by
EM waves
3
General Info
  • All EM waves travel at the same speed.
  • However, have different wavelengths and
    frequencies.
  • The higher the frequency of a wave
  • The higher its energy
  • EM spectrum Range of EM waves in order of
    increasing frequency.

4
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5
Radio Waves
  • Longest Wavelength lowest frequency
  • Includes
  • Broadcast waves Carry signals for radio and TV
  • Microwaves
  • Cook/heat food
  • Cell phone communication
  • RADAR uses Doppler effect to calculate speed.

6
Infrared Rays
  • Ex Invisible heat you feel from a burner on a
    stove.
  • More energy than radio waves
  • Heat Lamp uses infrared rays (uses very little
    visible light)
  • Infrared cameras Takes pictures using IR rays
    instead of light
  • Makes a thermogram

7
Visible Light
  • ONLY EM waves you can see
  • Longest WL are red
  • Shortest WL are violet
  • White light is a mixture of many colors
  • Can be separated into colors by a prism

Orange Yellow Green Blue Indigo
ROYGBIV
8
Ultraviolet Rays (UV)
  • More energy than light enough to damage or kill
    living cells!!
  • Small doses are useful
  • Causes skin cells to produce Vit. D
  • Large doses are harmful
  • Burn skin
  • Cause skin cancer
  • Damage eyes

9
X-rays
  • More energy than UV
  • Can penetrate most matter unless it is too
    dense such as bone or lead
  • Uses
  • Images of bones
  • Images of cracks in steel or concrete
  • Harmful if too much exposure to X-rays
  • can cause cancer

10
Gamma Rays
  • Most energy of all waves most penetrating
    most dangerous!
  • Produced by
  • Some radioactive substances
  • Certain nuclear reactions
  • Uses
  • Medical can be used to kill cancer cells
  • Can be injected to form an image of inside of body
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