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*Electromagnetic Radiation

*Electromagnetic Radiation. E l ectromagnetic radiation can be described in terms of a stream of photons. Each photon is traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy.

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*Electromagnetic Radiation

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  1. *Electromagnetic Radiation • Electromagnetic radiation can be described in terms of a stream of photons. Each photon is traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy. • The only difference amongst radio waves, visible light, and gamma-rays is the amount of energy of the photons. Radio waves have photons with low energies. Microwaves have a little more energy than radio waves. Infrared has still more energy. • As we move down the chart we see visible, ultraviolet, X-rays, and gamma-rays whose photon energies gradually increase. • Gamma and Cosmic rays have the highest energy waves.

  2. Remember radio waves are long…and gamma rays are small Radio-TV -Microwave- Infrared - VISIBLE -Ultraviolet -X-rays - Gamma- Cosmic

  3. Radio(Longest electromagnetic waves) • Emitted by • Astronomical Objects • Radio Station Transmitters • Detected by • Ground based radio telescopes • *If you turn on a radio,, it will convert the radio wave energy into sound energy.

  4. Television • Shorter than radio, also used to carry messages (pictures & sound) to our TV sets. • *We can sense the TV waves around us with our televisions.

  5. Microwave • Emitted by: • Gas clouds collapsing into stars • Microwave Ovens • Radar Stations • Cell Phones • Detected by • Microwave Telescopes • Food (heated) • Cell phones • Radar (systems)

  6. Infrared(Heat or Thermal)Are you a source of infrared? YES you are! • Emitted by • Sun and stars (Near) • TV Remote Controls • Food Warming Lights (Thermal) • *Everything at room temperature or above,=HEAT • Detected by • Infrared Cameras • TVs, VCRs, • Your skin

  7. VisibleEachcolorisa differentsizewave.Red the longest & violet the shortest • Emitted by • The sun and other astronomical objects • Laser pointers • Light bulbs • Detected by • Cameras (film or digital) • Human eyes • Plants (red light) • Telescopes RoyG.Biv

  8. Prism Power: Roy G. Biv • *What happens when light shines through prisms?

  9. UltravioletSunburn / black light • Emitted by • Tanning booths (A) • The sun (A) • Black light bulbs (B) • UV lamps • Detected by • Space based UV detectors • UV Cameras • Flying insects (flies) He can get skin cancer!

  10. X-ray • Emitted by • Astronomical objects • X-ray machines • CAT scan machines • Older televisions • Radioactive minerals • Airport luggage scanners • Detected by • Space based X-ray detectors • X-ray film • CCD detectors

  11. Sources of Gamma-ray Emission • • Black holes • • Active Galaxies • • Pulsars • • Diffuse emission • • Supernova • Gamma-ray bursts • • Unidentified

  12. COSMIC Rays(The highest energy waves and the deadliest) • Cosmic rays come from deep space and can pass through the Earth.

  13. How big are the waves? • A great question! • Radio waves= (Buildings to human size); • Microwaves (Humans-beetles); • Infrared waves (Eye of a needle); Visible waves (microscopic size)! WOW! All the rest are the size of molecules, atoms, atomic nuclei and smaller..

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