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Electromagnetic Waves

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Title: Electromagnetic Waves Author: Dennis Jung Last modified by: Dennis Jung Created Date: 10/25/2004 12:56:21 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Electromagnetic Waves


1
http//gtn.sonoma.edu/public/resources/presentati
ons/06_03_02/img003.jpg
2
Electromagnetic Waves
  • EM waves are created by vibrating electric
    charges. (electrons in atoms!)
  • These do not need a medium because they travel by
    transferring energy between electric and magnetic
    fields.

3
Electromagnetic Waves
  • These electric and magnetic fields continually
    create one another allowing for EM waves to exist.

http//www.monos.leidenuniv.nl/smo/basics/images/
wave.gif
Click Here for a 3D EM Wave Demo
4
EM Wave Properties
  • The speed of an EM wave depends on the medium it
    is traveling through.
  • As the medium becomes more dense, the speed
    decreases!

http//micro.magnet.fsu.edu/primer/java/speedofli
ght/javalightspeedfigure1.jpg
5
EM Wave Properties
  • In a vacuum, EM waves travel at 300,000,000 m/s.
  • Air is 299,997,000 m/s so we will use 300,000,000
    m/s for simplicity.

6
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7
Scientific Notation
  • Removes extra zeros from numbers to make them
    smaller.
  • Example
  • 300,000,000. m/s
  • 3.0 x 108 m/s

8
Scientific Notation
  • Move decimal to the left positive exponent.
  • 23,000,000.
  • Left 7 spaces
  • 2.3 x 107

9
Scientific Notation
  • Move decimal to the right negative exponent.
  • 0.0000067
  • Right 6 spaces
  • 6.7 x 10-6

10
Scientific Notation Calculations
  • Multiplication
  • Multiply the mantissas.
  • Add the exponents.
  • Mantissa must have only 1 number in front of the
    decimal.

11
Scientific Notation Calculations
  • Example
  • (3.0 x 104) x (4.0 x 103)
  • 12.0 x 107 , but the mantissa is bigger than 10
    so.
  • 1.2 x 108

12
Scientific Notation Calculations
  • Division
  • Divide the mantissas.
  • Subtract the exponents.
  • Mantissa must have only 1 number in front of the
    decimal.

13
Scientific Notation Calculations
  • Example
  • (2.0 x 107) / (4.0 x 103)
  • 0.5 x 104 , but the mantissa is less than 1 so
  • 5.0 x 103

14
Scientific Notation Calculators
15
Scientific Notation Calculators
  • Graphing or 2-line (6.67 x 10-11)
  • Enter 6.67
  • Press the EE Key
  • Enter -11
  • 6.67 x 10-11

16
Scientific Notation Calculators
  • One Line (3.71 x 10-5)
  • Enter 3.71
  • Press the EE Key or EXP Key
  • Enter -5
  • 3.71 x 10-5

17
Scientific Notation Calculators
  • For both calculators, when entering negative
    exponents use the negative key not the minus
    sign key!!!
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