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Electromagnetic Radiation

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Electromagnetic Radiation Electromagnetic Waves Changing electric and magnetic fields can transmit energy across empty space Energy produced is electromagnetic ... – PowerPoint PPT presentation

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Title: Electromagnetic Radiation


1
Electromagnetic Radiation
2
Electromagnetic Waves
  • Changing electric and magnetic fields can
    transmit energy across empty space
  • Energy produced is electromagnetic radiation

3
Speed, Wavelength, and Frequency of EM Radiation
  • c (speed of light) 3.00 x 108 m/s
  • c ?f
  • as wavelength increases, frequency decreases and
    vice versa

4
The Electromagnetic Spectrum
  • Range of wavelengths
  • Logarithmic scale because it spans such a large
    range of values

5
Radio Waves
  • Radio, television, cell phones
  • Transducersconvert sound into electrical signals
  • FMfrequency modulated (shorter)
  • AMamplitude modulated

6
Microwaves
  • Telecommunicationsatellites
  • Microwave oven

7
Infrared Radiation
  • Thermal radiation
  • Electric heater
  • Infrared thermometer
  • Remote control

8
Visible Light
  • Eyes detect these waves
  • ROYGBIV
  • White lightmixture of all of the colors of the
    visible spectrum
  • See color when that wavelength is reflected

9
Ultraviolet Radiation
  • Sunlight
  • Ozone molecules absorb most
  • Water purifiers
  • Sterilizing instruments

10
X Rays
  • High energy
  • Medicine
  • Airport security

11
Gamma Rays
  • Produced by nuclear reactions and by radioactive
    nuclei
  • Medical uses

12
The Photoelectric Effect
  • Photonsbundles of energy
  • Plancks constant
  • Energy of a photon is proportional to the
    frequency of the electromagnetic radiation.
    Plancks constant is that proportionality.
  • h 6.626176 x 10-34 Js
  • Ephoton hc/?

13
The Photoelectric Effect
  • Work function
  • The energy required to break an electron out of
    a metallic surfaceF
  • Hf F KEe
  • Photon energy (speed of light/wavelength) work
    function kinetic energy
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