# Beta version

BETA TEST VERSION OF THIS ITEM

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

# Calculations - enter your data here

Wavelength | ||

Wavelength | => | |

Length unit | ||

Wave frequency | ||

Wave frequency | <= | |

Frequency unit | ||

Wave propagation speed | ||

Wave velocity | ||

Velocity unit |

# Some facts

**Electromagnetic waves**are**disturbances of electromagnetic field**displaced in space.- Electromagnetic waves
**propagate at the speed of light**. - One of the most basic parameters describing a wave (not only electromagnetic) is its
**frequency**. - Since the
**frequency of the wave is directly related to its length**, we can equally**determine the wave by giving its length**. The relationship between the length and the frequency of the electromagnetic wave is as follows:

$\lambda = \dfrac{c}{\nu}$where:

- $\lambda$ - wavelength,

- $\nu$ - wave frequency,

- $c$ - speed of light.

- $\lambda$ - wavelength,
- The
**waves classification**based on the wavelength or frequency**is conventional**and has the**practical meaning**. This means that individual sources may deliver different bands. - The classification based on wavelength
**does not have to be strictly consistent**with frequency based one. Often**for convenience**(i.e. to avoid fractional values), we**round speed of light**to 300,000 km/s when converting one classification to another. - The properties of electromagnetic waves are described by
**Maxwell's equations**:

$\begin{aligned} & \nabla \times \vec{E} = -\dfrac{\partial \vec{B}} {\partial {t}} \\ & \nabla \times \vec{B} = \mu \vec{j} +\mu \varepsilon \dfrac{\partial \vec{E}} {\partial {t}} \\ & \varepsilon \nabla \cdot \vec{E} = \rho \\ & \nabla \cdot \vec{B} = 0 \end{aligned}$gdzie:

- $\nabla$ - Nabla's operator (del),

- $\vec{B}$ - magnetic induction,

- $\vec{E}$ - electric field,

- $\varepsilon$ - medium permittivity,

- $\mu$ - medium permeability.

- $\nabla$ - Nabla's operator (del),
- Historically, phenomena related to electricity and magnetism (and therefore the electric and magnetic field and their changes) were two separate branches of science. Maxwell's equations gave a coherent description
**joining both fields into one**. Thanks to this, there is no need to speak separately about the magnetic and electric field anymore. We can simply use the term**electromagnetic field**instead. - Electric and magnetic fields are
**special cases**of the electromagnetic field. Despite a coherent mathematical apparatus, which**eliminates the need to distinguish between these two types of fields**, sometimes the concepts of magnetic or electric field are used separately if it's handful.

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