Electromagnetic wave
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Related wiki pages: SWR, Propagation, Electronic Theory, harmonics
The image below is of a pure sine wave <math> y = sinx </math>
- 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 <math> \lambda </math> 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 <math> v = f \times \lambda </math>
- Period = 1/frequency <math> p = \frac {1}{f} </math>