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Properties of EM Radiation

Properties of EM Radiation. GAVRT Chapter 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=f l. Sound. Longitudinal Wave

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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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