Frequency

From Citizendium, the Citizens' Compendium
Jump to: navigation, search
This article is a stub and thus not approved.
Main Article
Talk
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.

Frequency is a property of an oscillation, vibration, or other regularly-repeating (cyclic) phenomenon. The frequency of such a phenomenon is the number of repetitions (cycles) in a unit of time. In the SI system of units, frequency is measured in Hertz (Hz), the number of repetitions in one second.

The frequency ( f ) of vibrations is inversely proportional to wavelength ( λ ), which is a length measurement:

, where c is the speed of propagation of waves in the medium, or, for electromagnetic radiation, c = 299 792 458 m/s, the speed of light.

In electromagnetic radiation, the energy of the vibration is proportional to the frequency:

, where h = 6.626 x 10-34 J•s (Planck's constant)