Electromagnetic wave

Related wiki pages: SWR, Propagation, Electronic Theory, harmonics

The image below is of a pure sine wave $$ y = sinx $$


 * The Amplitude of the wave a is the distance from the median line of the wave to either a peak or a trough.


 * The wavelength $$ \lambda $$ is the distance betwwen two corresponding point on successive waves, and is measured in metres.




 * The period of a wave is the time it takes for it to pass a fixed reference point, and is measured in seconds.


 * Frequency is the number of waves that pass a fixed reference point per second, with units Hertz (Hz) where 1 Hz = 1 complete cycle per second.

The velocity of electromagnetic waves is close to the speed of light in the atmosphere, approximately 300 000 000 m/s.

Some Math

 * Velocity = Frequency x Wavelength  $$ v = f \times \lambda $$


 * Period = 1/frequency $$ p = \frac {1}{f} $$