1. RFID
The EM Spectrum

2. Electromagnetic waves
formed when an electric field (the blue arrows) couples with a magnetic field (the red arrows)
magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave.

3. Properties of EM Waves Wavelength - m Frequency - Hz Energy - eV
ElectronVolt: It is the amount of kinetic energy gained by a single unbound electron when it passes through an electrostatic potential difference of one volt, in vacuum. In other words, it is equal to one volt (1 volt = 1 joule per coulomb) times the charge of a single electron
Freq = cycles per second

4. Properties of the EM Spectrum
Typical Units Vary with the Spectrum

5. Observing the EM Spectrum?