Properties of EM Radiation

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Presentation transcript:

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=fl

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

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 Picture of EM spectrum State that em wave has electric and magnetic components which vibrate perpendicular to one another Use ROY G BiV for visible light spectrum

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

Polarization Light Filter Demo Picket Fence analogy Only possible for transverse waves Linear Polarization Vertical Horizontal Circular Polarization Picket fence picture in Hewitt Use coat hanger sine wave to demonstrate circular polarization

GAVRT Bands S Band X Band 15-7.5 cm wavelength 2-4 GHz in frequency Show v=f x lambda relationship