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ELECTROMAGNETIC RADIATION. And Its. SPECTRUM. What is Electromagnetic Spectrum?. The electromagnetic spectrum is a collection of electromagnetic waves arranged according to frequency and wavelength. How EMR’s are formed.

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Presentation Transcript
what is electromagnetic spectrum
What is Electromagnetic Spectrum?
  • The electromagnetic spectrum is a collection of electromagnetic waves arranged according to frequency and wavelength.
how emr s are formed
How EMR’s are formed

Electromagnetic waves are formed when an electric field (which is shown in blue arrows) couples with a magnetic field (which is shown in red arrows).

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WHAT ARE WAVES? WHAT IS WAVELENGTH?

WAVES:

Waves are a series of crests and troughs moving past a given reference point.

WAVELENGTH:

It is the distance from one point on a wave to the corresponding point on the next consecutive wave.

slide5

WHAT AREELECTROMAGNETICWAVES?

Static electricity can make your hair stand on end. Magnets can attract certain metals.

Radio waves, TV waves and microwaves are all types of electromagnetic waves. However, they differ in wavelength and energy.

slide6

Scientific Notation

POWER DECIMAL PREFIX PHONIC SYMBOL

OF TEN EQUIVALENT

10 12 1 000 000 000 000 tera ter'a T

10 9 1 000 000 000 giga gi'ga G

10 6 1 000 000 mega meg'a M

10 3 1 000 kilo kil'o k

slide7

COMPARISON OF WAVE LENGTHS WITH IN THE ELECTROMAGNETIC SPECTRUM

FREQUENCY = the number of cycles per second

HERTZ = the unit attached to frequency

slide8

EMR SPECTRUM CHARACTERISTICS

Radio Micro Infra Visible UV X-rays Gamma

Waves Waves Red Light Light Rays

----

Frequency

Wavelength

---

Energy

common hertz relationships
Common Hertz Relationships

HERTZ TYPE

____________________________________________________________________________________________________

approximately 60 Electrical power

_______________________________________________________________________________

5 - 20000 (20 k) audio frequencies - human

_______________________________________________________________________________

10 k - 30 G radio frequencies _______________________________________________________________________________

540 k -1600 k Amplitude Modulation (AM)

_______________________________________________________________________________ 88 M -108 M Frequency Modulation (FM)

________________________________________________________________________________

30 M - 300 M VHF - TV (very high frequency)

________________________________________________________________________________

54 M - 890 M CATV (Cable Antenna Television)

________________________________________________________________________________

300 M - 3000 M (3 G) UHF - TV (ultra high frequency)

________________________________________________________________________________

3 G - 30 microwave (super high frequency)

________________________________________________________________________________

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FEDERAL COMMUNICATIONSCOMMISSION

Government Agency that Monitors and Controls Mass Communication Industries

slide12

WHY USE MICROWAVES

FOR COMMUNICATION?

Microwaves are good for transmitting information because their energy can penetrate fog, light rain and snow, clouds and smoke.

slide13

SATELLITE ORBITS

Three basic kinds of orbits:

1)GEOSYNCHRONOUS

- also called Geostationary or Synchronous)

2)Asynchronous

- used by space shuttle

- very low altitude (400 miles)

- pass over at different times of the day

3)Polar

- low altitude

- passes over the earth’s poles on each revolution

references
References
  • Date obtained: September 21, 2005

http://imagers.gsfc.nasa.gov/ems/ems.html

  • Date obtained: September 21, 2005

http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html