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 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 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

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
Picket fence picture in Hewitt
Use coat hanger sine wave to demonstrate circular polarization

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