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Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation

Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation. Electromagnetic Radiation transverse waves produced by the motion of electrically charged particles does not require a medium speed in a vacuum = 300,000 km/s electric and magnetic components are perpendicular.

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Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation

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  1. Electromagnetic Radiation EM Radiation • EM Spectrum • Types of EM Radiation

  2. Electromagnetic Radiation • transverse waves produced by the motion of electrically charged particles • does not require a medium • speed in a vacuum = 300,000 km/s • electric and magnetic components are perpendicular A. EM Radiation

  3. Photons • tiny, particle-like bundles of radiation • absorbed and released by electrons A. EM Radiation • energy increases with wave frequency

  4. B. EM Spectrum long  low f low energy short  high f high energy

  5. Radiowaves • lowest energy EM radiation C. Types of EM Radiation

  6. Radiowaves • FM - frequency modulation • AM - amplitude modulation C. Types of EM Radiation • Microwaves • penetrate food and vibrate water & fat molecules to produce thermal energy

  7. Infrared Radiation(IR) • slightly lower energy than visible light • can raise the thermal energy of objects • thermogram - image made by detecting IR radiation C. Types of EM Radiation

  8. R O Y G. B I V red orange yellow green blue indigo violet • Visible Light • small part of the spectrum we can see • ROY G. BIV - colors in order of increasing energy C. Types of EM Radiation

  9. Ultraviolet Radiation (UV) • slightly higher energy than visible light • Types: • UVA - tanning, wrinkles • UVB - sunburn, cancer • UVC - most harmful, sterilization C. Types of EM Radiation

  10. Ultraviolet Radiation (UV) • Ozone layer depletion = UV exposure! C. Types of EM Radiation

  11. X rays • higher energy than UV • can penetrate soft tissue, but not bones C. Types of EM Radiation

  12. Radiation treatment using radioactive cobalt-60. • Gamma rays • highest energy EM radiation • emitted by radioactive atoms • used to kill cancerous cells C. Types of EM Radiation

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