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Understanding Electromagnetic Waves: Properties, Applications, and Effects

Chapter 9 explores the nature of electromagnetic waves, which can travel through a vacuum at a speed of 300,000 kilometers per second. It discusses the fundamental relationship between changing electric and magnetic fields, and how electric currents produce magnetic fields. The chapter also addresses the dual nature of electromagnetic radiation (EMR) as both wave and particle. Key topics include various types of EM waves, from radio to gamma rays, and their applications in everyday technology and medicine, highlighting their importance in life and health.

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Understanding Electromagnetic Waves: Properties, Applications, and Effects

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  1. Chapter 9 The Nature of Electromagnetic Waves

  2. Electromagnetic Radiation • EMR requires no medium to travel- can travel thru a vacuum • Speed • 300,000 kilometers /sec • 186,000 miles /sec • Consists of changing electric and magnetic fields

  3. Changing electric and magnetic fields • Electric field is a region where particles can be pushed or pulled. • Wherever there is an electric charge there is an electric field associated w/it. • A moving electric charge is part of an electric current • An electric current is surrounded by a magnetic field • A magnetic field is a region in which magnetic forces are present • When electric field changes – so does the magnetic field.

  4. EMR - Wave or Particle? • Acts like a wave sometimes – ie: Polarizing Filter

  5. EMR - Wave or Particle? • Acts like a particle, a photon, sometimes – ie: Photoelectric Cell

  6. EMS waves • Long wavelength : Low Frequency & Low Energy • Short wavelength : High Frequency & High Energy

  7. Radio & Microwaves • Longest wavelengths & lowest frequency of the EMS • Include Am, FM and Television frequencies • AM – Amplitude modulation: same frequency waves just a change in the amplitude to get different sounds etc. • FM – Frequency Modulation: slight changes in frequency

  8. Microwave & Infrared EMR • Microwave: used in microwave ovens & cellular phones • Infrared: Fast Food Heat Lamps, use as a night time surveillance tool.

  9. Visible Light • White light is a mixture of the entire visible light spectrum

  10. UV, Xray & Gamma rays • UV from the Sun helps the body produce vitamin D, too much exposure can cause skin cancer • Xrays: used extensively in medicine to see “into” the body • Gamma Rays: used in medicine to treat cancer or destructive radiation from nuclear explosions.

  11. I can’t think of nuttin’ else for Chapter 9!!TTFN !

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