II.) Electromagnetic Spectrum - PowerPoint PPT Presentation

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II.) Electromagnetic Spectrum

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Electromagnetic Spectrum A) The Waves of the Spectrum 1) ... The EM spectrum includes radio waves, ... and to communicate with one another. F) ... – PowerPoint PPT presentation

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Title: II.) Electromagnetic Spectrum


1
II.) Electromagnetic Spectrum
  • A) The Waves of the Spectrum
  • 1) EM spectrum all of the frequencies or
    wavelengths of electromagnetic radiation
  • 2) The EM spectrum includes radio waves,
    microwaves infrared rays, visible light, UV rays,
    X-rays, and gamma rays.

2
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3
  • B) Radio Waves
  • -Longest wavelength
  • -Lowest Frequency
  • 1) Radio waves are used in radio TV
    technologies, as well as in radar.
  • a) Radio
  • 1) Amplitude modulation (AM)
  • 2) Frequency modulation (FM)
  • b) Radar
  • 1) Send out short bursts of radio waves that
    bounce off objects return to receiver

4
  • C) Microwaves
  • -Shorter wavelength than radio waves
  • -Higher frequency than radio, but lower than
    infrared
  • 1) Only penetrate food at the surface

5
  • D) Infrared Waves
  • -Shorter wavelength than microwaves
  • -Higher frequency than microwaves, but lower
    than red light
  • 1) Infrared rays are used as a source of heat
    to discover areas of heat difference
  • 2) You cant see infrared radiation, but your
    skin feels its warmth

6
  • E) Visible Light
  • -Each wavelength corresponds to a specific
    frequency
  • Color determined by frequency
  • 1) People use visible light to see, help keep
    them safe, and to communicate with one another.

7
  • F) UV Rays
  • -Shorter wavelength and higher frequency than
    violet light
  • 1) UV rays have applications in health and
    medicine, and in agriculture.
  • a) Helps skin produce Vit. D, can cause
    sunburn, cancer, and used to kill
    microorganisms

8
  • G) X-Rays
  • -Shorter wavelength and higher frequency than UV
    rays
  • 1) X-rays are used in medicine, industry, and
    transportation to make pictures of the inside of
    solid objects.
  • a) X-rays are absorbed by solid objects
    (teeth, bones) so solid objects appear white

9
  • H) Gamma Rays
  • -Shortest wavelength
  • -Highest frequency
  • 1) Gamma rays are used in the medical field to
    kill cancer cells and to make pictures of the
    brain in industrial situations as an inspection
    tool.
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