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Ch. 18 – The Electromagnetic Spectrum

Ch. 18 – The Electromagnetic Spectrum. I. Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation. A. EM Radiation. Electromagnetic Radiation transverse waves produced by the motion of electrically charged particles does not require a medium

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Ch. 18 – The Electromagnetic Spectrum

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  1. Ch. 18 – The Electromagnetic Spectrum I. Electromagnetic Radiation • EM Radiation • EM Spectrum • Types of EM Radiation

  2. A. 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

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

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

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

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

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

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

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

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

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

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