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Electromagnetic Waves

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Electromagnetic Waves Things to know frequency how often a wave passes a point in a certain time interval wavelength- the distance from one crest to the next or ... – PowerPoint PPT presentation

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Title: Electromagnetic Waves


1
Electromagnetic Waves
2
  • Electromagnetic waves are transverse waves
    consisting of changing electric and magnetic
    fields.
  • Energy travels in the form of waves.
  • They can travel in a vacuum as well as through
    matter.
  • Electromagnetic radiation-
  • the transfer of energy by
  • electromagnetic waves
  • traveling through matter or
  • across space.

3
Light, like sound and heat, is a form of energy.
The visible light we see is part of the
electromagnetic spectrum.
4
Things to know
  • frequency how often a wave passes a point in a
    certain time interval
  • wavelength- the distance from one crest to the
    next or one trough to the next

5
The speed of light depends on the medium.
6
  • The speed of light in a vacuum is
  • 3 X 108 meters per second (300,000,000 m/sec)

7
The Electromagnetic Spectrum
  • Electromagnetic Spectrum- the full range of
    frequencies of electromagnetic radiation.
  • This spectrum includes visible light and
    invisible waves
  • radio wave
  • microwaves
  • infrared light
  • ultraviolet light
  • X-rays
  • gamma rays

8
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10
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11
Wavelength and Frequency
12
Wavelength and Frequency of Light
Because the wavelength of light is so small,
scientists measure it in nanometers. One
nanometer (nm) is one billionth of a meter
(0.000000001 m).
13
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14
The electromagnetic spectrum includes
15
Radio Waves
  • Has the longest wavelength and the lowest
    frequency.
  • Uses Radio, TV, radar, microwaves
  • Radar radio detection and ranging, a system that
    uses reflected radio waves to determine the
    velocity and location of objects

16
Microwaves
  • Microwaves are used in cooking and communication.
  • Microwaves have wavelengths in the range of
    centimeters.

17
Infrared Rays
  • Wavelength smaller than radio.
  • slightly longer than red visible light.
  • felt as warmth
  • Used as a source of heat/or to detect heat
    differences.
  • Thermograms-
  • color-coded pictures
  • that show variations
  • in temperature.

18
Visible Light
  • Each wavelength in the visible spectrum
    corresponds with a specific frequency and a
    specific color.
  • Light enables people
  • to see, keeps people
  • safe and helps them
  • to communicate.

19
Ultraviolet Rays
  • Shorter wavelength and higher frequency than
    violet light.
  • Sunlight contains ultraviolet light.
  • The invisible light that lies just beyond violet
    light falls into the ultraviolet (UV) portion of
    the spectrum.

20
X-Rays
  • Have very short wavelengths.
  • Less than 108 m.
  • Used in medicine, industry and transportation
    by making pictures of the inside of solid
    objects.

21
Gamma Rays
  • Shortest wavelength in the electromagnetic
    spectrum.
  • wavelengths shorter than 1010 m.
  • Have the highest frequency.
  • Have the most energy.
  • Over exposure can be
  • deadly.
  • Used in the medical field
  • to kill cancer cells and make pictures of the
    brain, and in industrial situations as an
    inspection tool.
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