Electromagnetic wave: Difference between revisions
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Related wiki pages: [[SWR]], [[Propagation]], [[Electronic Theory]], [[harmonics]] | 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. | |||
[[Image:Vk4yeh_EM_wave.jpg |400px]] | [[Image:Vk4yeh_EM_wave.jpg |400px]] | ||
* 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> |
Revision as of 23:45, 26 August 2008
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>