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Properties of EM Radiation

Explore the properties of electromagnetic radiation in this chapter covering general wave characteristics, types of waves, the EM spectrum, propagation laws, and polarization phenomena. Learn about different wavelength bands and frequencies in the GAVRT system.

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Properties of EM Radiation

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  1. Properties of EM Radiation GAVRT Chapter 2

  2. Waves in General • Wiggle in space and time • Caused by a vibration of some sort • Transfer energy not mass • Frequency, wavelength and amplitude • Longitudinal vs Transverse • Mechanical vs Electromagnetic • V=fl

  3. Sound • Longitudinal Wave • Mechanical Wave • Travels fastest through dense material • Produced by some mechanical vibration • Human Hearing • 60-6000 Hz • Amplitude and frequency heard as loudness and pitch

  4. EM Spectrum • Waves all produced by vibrating electric charge • Waves are transverse and electromagnetic • Waves all travel at 300 000 km/s in vacuum • Waves differ in frequency and wavelength • Visible light spectrum • C=fl

  5. Inverse Square law of Propagation • Butter gun analogy • Area of butter is analogous to spread of signal • Thickness or amount of butter in space analogous to strength of signal • Examples

  6. Polarization • Light Filter Demo • Picket Fence analogy • Only possible for transverse waves • Linear Polarization • Vertical • Horizontal • Circular Polarization

  7. GAVRT Bands • S Band • 15-7.5 cm wavelength • 2-4 GHz in frequency • X Band • 3.75-2.4 cm wavelength • 8-12 GHz in frequency

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