Electromagnetic radiation (EMR) is a form of energy that is produced by oscillating electric and magnetic disturbance, or by the movement of electrically charged particles traveling through a vacuum or matter. DQ
Electrical waves travel at vertical polaristaion with magnetic waves travelling at horizontal polarisation.
Electrical waves travel at vertical polaristaion with magnetic waves travelling at horizontal polarisation.
Image Source: http://astronomy.swin.edu.au/cosmos/E/electromagnetic+radiation
In the 19th Century James Clerk Maxwell discovered that electromagnetic waves travel at the speed of light, c = 299,792,458 m/s (in a vacuum).
![Picture](/uploads/2/4/2/5/24259907/7252275.jpg?368)
Amplitude is from the centre of the wave measured to the trough or crest.
Wavelength (λ) a complete 360 degree cycle of a wave.
Frequency (f) measured in Hertz is the total number of wave cycles that pass through a certain length of time.
Wavelength (λ) a complete 360 degree cycle of a wave.
Frequency (f) measured in Hertz is the total number of wave cycles that pass through a certain length of time.
Electromagnetic Radiation
"EM spectrum". Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:EM_spectrum.svg#/media/File:EM_spectrum.svg
Electromagnetic radiation with frequencies between about 10 kHz and 100 GHz are referred to as radio frequencies.