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Electromagnetic Radiation

Electromagnetic Radiation. Waves… a review. Most waves are either longitudinal or transverse. Sound waves are longitudinal. But all electromagnetic waves are transverse…. ?. ?. Electromagnetic Spectrum BBC Video Clip.

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Electromagnetic Radiation

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  1. Electromagnetic Radiation

  2. Waves… a review • Most waves are either longitudinal or transverse. • Sound waves are longitudinal. • But all electromagnetic waves are transverse…

  3. ? ?

  4. Electromagnetic Spectrum BBC Video Clip

  5. What does this picture show about the relationship between frequency and wavelength?

  6. Types of EM Radiation • Radiowaves • lowest energy EM radiation

  7. Electromagnetic waves • Produced by the movement of electrically charged particles • Can travel in a “vacuum” (they do NOT need a medium) • Travel at the speed of light • Also known as EM waves

  8. Radio waves • Longest wavelength EM waves • Uses: • TV broadcasting • AM and FM broadcast radio • Heart rate monitors • Cell phone communication • MRI (MAGNETIC RESONACE IMAGING) • Uses Short wave radio waves with a magnet to create an image

  9. Microwaves • Wavelengths from 1 mm- 1 m • Uses: • Microwave ovens • Bluetooth headsets • Broadband Wireless Internet • Radar • GPS

  10. Infrared Radiation • Wavelengths in between microwaves and visible light • Uses: • Night vision goggles • Remote controls • Heat-seeking missiles

  11. Visible light • Only type of EM wave able to be detected by the human eye • Violet is the highest frequency light • Red light is the lowest frequency light

  12. Ultraviolet • Shorter wavelengths than visible light • Uses: • Black lights • Security images on money • Harmful to living things • Used to sterilize medical equipment • Too much causes sun burn • Extremely high exposure can cause skin cancer

  13. X-rays • Tiny wavelength, high energy waves • Uses: • Medical imaging • Airport security • Moderate dose can damaging to cells

  14. Gamma Rays • Smallest wavelengths, highest energy EM waves • Uses • Sterilizes medical equipment • Cancer treatment to kill cancer cells • Kills nearly all living cells.

  15. Extention • Catch a Wave – Discovery Education Exploration

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