|The EM Spectrum|
|Long wavelength radio||> 600|
|Broadcast radio band||600 - 200 m|
|Microwave||200 m - 0.1 mm|
|Infrared||0.1 - 0.0007 mm|
|visible (light)||0.7 - 0.4 micron|
|Ultraviolet||0.4 micron - 1 nm|
|X-rays||1 nm - 0.1 pm|
|Gamma rays||< 0.1 nm|
Color patterns on soap films is due to interference of waves.
EM radiation travels at constant velocity
EM radiation is the transmission of energy by EM wave without a medium.
As waves, EM radiation is characterized by frequency, wavelength, wavenumber, and energy.
E = h n
h is the Planck constant, (= 6.62619x10-34 J), and E the energy of the bundle he called quanta, or photons.
E = 2.8e-19 J = 1.8 eV